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This Special Issue reprint aims to collect new or improved ideas to exploit superconducting materials, as well as graphene, towards achieving innovative devices, either at a small scale, as well as at a large scale. Several potential applications of graphene are enhanced by the possibility to modify its surface to introduce a non-zero bandgap, to tune adhesion and/or hydrophobicity/hydrophilicity, etc. These surface properties are crucial to the realization of graphene-based devices. Papers demonstrating graphene and/or superconducting devices, device processing, characterization, and applications, are particularly welcomed. Topics in this Special Issue include, but are not limited to: Graphene devices Graphene based heterostructures Superconducting interfaces Superconducting devices Electronic, optical, photonic and magnetic properties Surface and interfacial characterization techniques Device integration and fabrication
Technology: general issues --- GFET --- RF --- access region --- superconducting devices --- photodetectors --- nanostructured materials --- nanostructured and microstructured superconductors --- high temperature superconductors --- bolometers --- quantum electronics --- noise spectroscopy --- granular aluminum oxide --- superconducting nanowires --- current-resistance effects --- iron-based superconductors --- nanowires --- single-photon detectors --- superconductivity --- transport properties --- energy gap --- superconducting order parameter --- proximity effect --- nano-junction --- Andreev reflection --- chemical --- vapor deposition --- graphene oxide --- transition-metal dichalcogenides --- WS2 --- perfect graphene (p-Gr) --- defective graphene (d-Gr) --- Gr/Si slab --- diffusion barrier --- CI-NEB calculation --- GFET --- RF --- access region --- superconducting devices --- photodetectors --- nanostructured materials --- nanostructured and microstructured superconductors --- high temperature superconductors --- bolometers --- quantum electronics --- noise spectroscopy --- granular aluminum oxide --- superconducting nanowires --- current-resistance effects --- iron-based superconductors --- nanowires --- single-photon detectors --- superconductivity --- transport properties --- energy gap --- superconducting order parameter --- proximity effect --- nano-junction --- Andreev reflection --- chemical --- vapor deposition --- graphene oxide --- transition-metal dichalcogenides --- WS2 --- perfect graphene (p-Gr) --- defective graphene (d-Gr) --- Gr/Si slab --- diffusion barrier --- CI-NEB calculation
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In this book the author presents two important findings revealed by high-precision magnetic penetration depth measurements in iron-based superconductors which exhibit high-transition temperature superconductivity up to 55 K: one is the fact that the superconducting gap structure in iron-based superconductors depends on a detailed electronic structure of individual materials, and the other is the first strong evidence for the presence of a quantum critical point (QCP) beneath the superconducting dome of iron-based superconductors. The magnetic penetration depth is a powerful probe to elucidate the superconducting gap structure which is intimately related to the pairing mechanism of superconductivity. The author discusses the possible gap structure of individual iron-based superconductors by comparing the gap structure obtained from the penetration depth measurements with theoretical predictions, indicating that the non-universal superconducting gap structure in iron-pnictides can be interpreted in the framework of A1g symmetry. This result imposes a strong constraint on the pairing mechanism of iron-based superconductors. The author also shows clear evidence for the quantum criticality inside the superconducting dome from the absolute zero-temperature penetration depth measurements as a function of chemical composition. A sharp peak of the penetration depth at a certain composition demonstrates pronounced quantum fluctuations associated with the QCP, which separates two distinct superconducting phases. This gives the first convincing signature of a second-order quantum phase transition deep inside the superconducting dome, which may address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.
Superconductivity. --- Superconductors -- Industrial applications. --- Superconductors -- Research -- History. --- Superconductivity --- Iron-based superconductors --- High temperature superconductors --- Physics --- Physical Sciences & Mathematics --- Electricity & Magnetism --- High temperature superconductors. --- Physics. --- Quantum physics. --- Superconductors. --- Magnetism. --- Magnetic materials. --- Strongly Correlated Systems, Superconductivity. --- Quantum Physics. --- Magnetism, Magnetic Materials. --- Electric conductivity --- Critical currents --- Superfluidity --- Materials at low temperatures --- Superconductors --- Quantum theory. --- Mathematical physics --- Electricity --- Magnetics --- Quantum dynamics --- Quantum mechanics --- Quantum physics --- Mechanics --- Thermodynamics --- Materials --- Superconducting materials --- Superconductive devices --- Cryoelectronics --- Electronics --- Solid state electronics
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Nuclear Magnetic Resonance (NMR) has been a fundamental player in the studies of superconducting materials for many decades. This local probe technique allows for the study of the static electronic properties as well as of the low energy excitations of the electrons in the normal and the superconducting state. On that account it has also been widely applied to Fe-based superconductors from the very beginning of their discovery in February 2008. This dissertation comprises some of these very first NMR results, reflecting the unconventional nature of superconductivity and its strong link to magnetism in the investigated compounds LaO1–xFxFeAs and LiFeAs.
Magnetics. --- Magnetism. --- Materials. --- Physics --- Physical Sciences & Mathematics --- Physics - General --- Iron-based superconductors. --- High temperature superconductivity. --- Nuclear magnetic resonance. --- Ferromagnetic materials. --- Magnetic resonance, Nuclear --- NMR (Nuclear magnetic resonance) --- Nuclear spin resonance --- Resonance, Nuclear spin --- High critical temperature superconductivity --- High Tc superconductivity --- Iron oxypnictide superconductors --- Iron oxypnictides --- Iron pnictide superconductors --- Iron pnictides --- Oxypnictide superconductors --- Oxypnictides --- Physics. --- Physics, general. --- Ferromagnetism --- Magnetic materials --- Magnetic resonance --- Nuclear spin --- Nuclear quadrupole resonance --- Superconductivity --- High temperature superconductors --- Natural philosophy --- Philosophy, Natural --- Physical sciences --- Dynamics
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This book studies the structural, magnetic and electronic properties of, as well as magnetic excitations in, high-temperature BaFe2-xNixAs2 superconductors using neutron diffraction and neutron spectroscopic methods. It describes the precise determination of the phase diagram of BaFe2-xNixAs2, which demonstrates strong magnetoelastic coupling and avoided quantum criticality driven by short-range incommensurate antiferromagnetic order, showing cluster spin glass behavior. It also identifies strong nematic spin correlations in the tetragonal state of uniaxial strained BaFe2-xNixAs2. The nematic correlations have similar temperature and doping dependence as resistivity anisotropy in detwinned samples, which suggests that they are intimately connected. Lastly, it investigates doping evolution of magnetic excitations in overdoped BaFe2-xNixAs2 and discusses the links with superconductivity. This book includes detailed neutron scattering results on BaFe2-xNixAs2 and an introduction to neutron scattering techniques, making it a useful guide for readers pursuing related research.
Phase diagrams. --- Superconductivity. --- Iron-based superconductors. --- Iron oxypnictide superconductors --- Iron oxypnictides --- Iron pnictide superconductors --- Iron pnictides --- Oxypnictide superconductors --- Oxypnictides --- Physics. --- Superconductors. --- Magnetism. --- Magnetic materials. --- Physical measurements. --- Measurement. --- Strongly Correlated Systems, Superconductivity. --- Measurement Science and Instrumentation. --- Magnetism, Magnetic Materials. --- Electric conductivity --- Critical currents --- Superfluidity --- High temperature superconductors --- Phase rule and equilibrium --- Physical metallurgy --- Mathematical physics --- Physics --- Electricity --- Magnetics --- Measurement . --- Materials --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Measurement --- Superconducting materials --- Superconductive devices --- Cryoelectronics --- Electronics --- Solid state electronics
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This volume presents an in-depth review of experimental and theoretical studies on the newly discovered Fe-based superconductors. Following the Introduction, which places iron-based superconductors in the context of other unconventional superconductors, the book is organized into three sections covering sample growth, experimental characterization, and theoretical understanding. To understand the complex structure-property relationships of these materials, results from a wide range of experimental techniques and theoretical approaches are described that probe the electronic and magnetic properties and offer insight into either itinerant or localized electronic states. The extensive reference lists provide a bridge to further reading. Iron-Based Superconductivity is essential reading for advanced undergraduate and graduate students as well as researchers active in the fields of condensed matter physics and materials science in general, particularly those with an interest in correlated metals, frustrated spin systems, superconductivity, and competing orders. Provides a detailed description of sample growth and characterization for correlated and complex materials Features extensive coverage of results from major experimental techniques that probe the electronic and magnetic properties of Fe-based superconductors Offers a comprehensive review of recent theoretical developments in electronic correlation and frustration Represents a one-stop reference for a broad audience from advanced undergraduate and graduate students through active researchers Written by leading experts in each of the relevant sub-fields.
Materials Science. --- Optical and Electronic Materials. --- Strongly Correlated Systems, Superconductivity. --- Magnetism, Magnetic Materials. --- Characterization and Evaluation of Materials. --- Magnetism. --- Optical materials. --- Surfaces (Physics). --- Magnétisme --- Matériaux optiques --- Surfaces (Physique) --- Materials. --- Superconductivity. --- Iron-based superconductors. --- Iron oxypnictide superconductors --- Iron oxypnictides --- Iron pnictide superconductors --- Iron pnictides --- Oxypnictide superconductors --- Oxypnictides --- High temperature superconductors --- Electric conductivity --- Critical currents --- Superfluidity --- Physics --- Surface chemistry --- Surfaces (Technology) --- Mathematical physics --- Electricity --- Magnetics --- Optics --- Materials --- Electronic materials. --- Superconductors. --- Magnetic materials. --- Materials science. --- Material science --- Physical sciences --- Superconducting materials --- Superconductive devices --- Cryoelectronics --- Electronics --- Solid state electronics --- Electronic materials
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This Special Issue reprint aims to collect new or improved ideas to exploit superconducting materials, as well as graphene, towards achieving innovative devices, either at a small scale, as well as at a large scale. Several potential applications of graphene are enhanced by the possibility to modify its surface to introduce a non-zero bandgap, to tune adhesion and/or hydrophobicity/hydrophilicity, etc. These surface properties are crucial to the realization of graphene-based devices. Papers demonstrating graphene and/or superconducting devices, device processing, characterization, and applications, are particularly welcomed. Topics in this Special Issue include, but are not limited to: Graphene devices Graphene based heterostructures Superconducting interfaces Superconducting devices Electronic, optical, photonic and magnetic properties Surface and interfacial characterization techniques Device integration and fabrication
Technology: general issues --- GFET --- RF --- access region --- superconducting devices --- photodetectors --- nanostructured materials --- nanostructured and microstructured superconductors --- high temperature superconductors --- bolometers --- quantum electronics --- noise spectroscopy --- granular aluminum oxide --- superconducting nanowires --- current-resistance effects --- iron-based superconductors --- nanowires --- single-photon detectors --- superconductivity --- transport properties --- energy gap --- superconducting order parameter --- proximity effect --- nano-junction --- Andreev reflection --- chemical --- vapor deposition --- graphene oxide --- transition-metal dichalcogenides --- WS2 --- perfect graphene (p–Gr) --- defective graphene (d–Gr) --- Gr/Si slab --- diffusion barrier --- CI-NEB calculation --- n/a --- perfect graphene (p-Gr) --- defective graphene (d-Gr)
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Plastic (and microplastic) pollution has been described as one of the greatest environmental challenges of our time, and a hallmark of the human-driven epoch known as the Anthropocene. It has gained the attention of the general public, governments, and environmental scientists worldwide. To date, the main focus has been on plastics in the marine environment, but interest in the presence and effects of plastics in freshwaters has increased in the recent years. The occurrence of plastics within inland lakes and rivers, as well as their biota, has been demonstrated. Experiments with freshwater organisms have started to explore the direct and indirect effects resulting from plastic exposure. There is a clear need for further research, and a dedicated space for its dissemination. This book is devoted to highlighting current research from around the world on the prevalence, fate, and effects of plastic in freshwater environments.
hybrid high voltage direct current transmission system --- resistive-type superconducting fault current limiter --- scheme design --- short-circuit fault --- Yttrium barium copper oxide materials --- transient simulation --- high pressure --- diamond anvil cell --- Raman spectroscopy --- electrical conductivity --- phase transition --- pressure-induced metallization --- iron-based superconductors --- critical currents --- flux pinning --- microstructure --- superconducting tape --- quench --- R-SFCL --- AC and DC overcurrent --- experiment --- finite element method (FEM) --- numerical modeling --- superconducting coil --- alternating current (AC) losses --- superconducting material law --- inductive fault current limiter --- magnetic flux shielding --- multiphysics simulation --- transient state --- field-circuit coupling method --- high-temperature superconducting bulk --- modeling --- magnetic levitation --- electromagnetic-thermo-force coupling --- high speed --- HTS --- bulk superconductors --- coated conductors --- mathematical modelling --- H-formulation
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This Special Issue reprint aims to collect new or improved ideas to exploit superconducting materials, as well as graphene, towards achieving innovative devices, either at a small scale, as well as at a large scale. Several potential applications of graphene are enhanced by the possibility to modify its surface to introduce a non-zero bandgap, to tune adhesion and/or hydrophobicity/hydrophilicity, etc. These surface properties are crucial to the realization of graphene-based devices. Papers demonstrating graphene and/or superconducting devices, device processing, characterization, and applications, are particularly welcomed. Topics in this Special Issue include, but are not limited to: Graphene devices Graphene based heterostructures Superconducting interfaces Superconducting devices Electronic, optical, photonic and magnetic properties Surface and interfacial characterization techniques Device integration and fabrication
GFET --- RF --- access region --- superconducting devices --- photodetectors --- nanostructured materials --- nanostructured and microstructured superconductors --- high temperature superconductors --- bolometers --- quantum electronics --- noise spectroscopy --- granular aluminum oxide --- superconducting nanowires --- current-resistance effects --- iron-based superconductors --- nanowires --- single-photon detectors --- superconductivity --- transport properties --- energy gap --- superconducting order parameter --- proximity effect --- nano-junction --- Andreev reflection --- chemical --- vapor deposition --- graphene oxide --- transition-metal dichalcogenides --- WS2 --- perfect graphene (p–Gr) --- defective graphene (d–Gr) --- Gr/Si slab --- diffusion barrier --- CI-NEB calculation --- n/a --- perfect graphene (p-Gr) --- defective graphene (d-Gr)
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Plastic (and microplastic) pollution has been described as one of the greatest environmental challenges of our time, and a hallmark of the human-driven epoch known as the Anthropocene. It has gained the attention of the general public, governments, and environmental scientists worldwide. To date, the main focus has been on plastics in the marine environment, but interest in the presence and effects of plastics in freshwaters has increased in the recent years. The occurrence of plastics within inland lakes and rivers, as well as their biota, has been demonstrated. Experiments with freshwater organisms have started to explore the direct and indirect effects resulting from plastic exposure. There is a clear need for further research, and a dedicated space for its dissemination. This book is devoted to highlighting current research from around the world on the prevalence, fate, and effects of plastic in freshwater environments.
Information technology industries --- hybrid high voltage direct current transmission system --- resistive-type superconducting fault current limiter --- scheme design --- short-circuit fault --- Yttrium barium copper oxide materials --- transient simulation --- high pressure --- diamond anvil cell --- Raman spectroscopy --- electrical conductivity --- phase transition --- pressure-induced metallization --- iron-based superconductors --- critical currents --- flux pinning --- microstructure --- superconducting tape --- quench --- R-SFCL --- AC and DC overcurrent --- experiment --- finite element method (FEM) --- numerical modeling --- superconducting coil --- alternating current (AC) losses --- superconducting material law --- inductive fault current limiter --- magnetic flux shielding --- multiphysics simulation --- transient state --- field-circuit coupling method --- high-temperature superconducting bulk --- modeling --- magnetic levitation --- electromagnetic-thermo-force coupling --- high speed --- HTS --- bulk superconductors --- coated conductors --- mathematical modelling --- H-formulation --- hybrid high voltage direct current transmission system --- resistive-type superconducting fault current limiter --- scheme design --- short-circuit fault --- Yttrium barium copper oxide materials --- transient simulation --- high pressure --- diamond anvil cell --- Raman spectroscopy --- electrical conductivity --- phase transition --- pressure-induced metallization --- iron-based superconductors --- critical currents --- flux pinning --- microstructure --- superconducting tape --- quench --- R-SFCL --- AC and DC overcurrent --- experiment --- finite element method (FEM) --- numerical modeling --- superconducting coil --- alternating current (AC) losses --- superconducting material law --- inductive fault current limiter --- magnetic flux shielding --- multiphysics simulation --- transient state --- field-circuit coupling method --- high-temperature superconducting bulk --- modeling --- magnetic levitation --- electromagnetic-thermo-force coupling --- high speed --- HTS --- bulk superconductors --- coated conductors --- mathematical modelling --- H-formulation
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This thesis combines highly accurate optical spectroscopy data on the recently discovered iron-based high-temperature superconductors with an incisive theoretical analysis. Three outstanding results are reported: (1) The superconductivity-induced modification of the far-infrared conductivity of an iron arsenide with minimal chemical disorder is quantitatively described by means of a strong-coupling theory for spin fluctuation mediated Cooper pairing. The formalism developed in this thesis also describes prior spectroscopic data on more disordered compounds. (2) The same materials exhibit a sharp superconductivity-induced anomaly for photon energies around 2.5 eV, two orders of magnitude larger than the superconducting energy gap. The author provides a qualitative interpretation of this unprecedented observation, which is based on the multiband nature of the superconducting state. (3) The thesis also develops a comprehensive description of a superconducting, yet optically transparent iron chalcogenide compound. The author shows that this highly unusual behavior can be explained as a result of the nanoscopic coexistence of insulating and superconducting phases, and he uses a combination of two complementary experimental methods - scanning near-field optical microscopy and low-energy muon spin rotation - to directly image the phase coexistence and quantitatively determine the phase composition. These data have important implications for the interpretation of data from other experimental probes.
High temperature superconducters. --- Iron-based superconductors. --- Iron oxypnictide superconductors --- Iron oxypnictides --- Iron pnictide superconductors --- Iron pnictides --- Oxypnictide superconductors --- Oxypnictides --- Physics. --- Superconductivity. --- Superconductors. --- Nanoscale science. --- Nanoscience. --- Nanostructures. --- Spectroscopy. --- Microscopy. --- Optical materials. --- Electronic materials. --- Nanotechnology. --- Strongly Correlated Systems, Superconductivity. --- Spectroscopy and Microscopy. --- Optical and Electronic Materials. --- Nanoscale Science and Technology. --- High temperature superconductors --- Molecular technology --- Nanoscale technology --- High technology --- Optics --- Materials --- Nanoscience --- Physics --- Nano science --- Nanoscale science --- Nanosciences --- Science --- Electronic materials --- Analysis, Microscopic --- Light microscopy --- Micrographic analysis --- Microscope and microscopy --- Microscopic analysis --- Optical microscopy --- Analysis, Spectrum --- Spectra --- Spectrochemical analysis --- Spectrochemistry --- Spectroscopy --- Chemistry, Analytic --- Interferometry --- Radiation --- Wave-motion, Theory of --- Absorption spectra --- Light --- Spectroscope --- Superconducting materials --- Superconductive devices --- Cryoelectronics --- Electronics --- Solid state electronics --- Electric conductivity --- Critical currents --- Superfluidity --- Qualitative --- Spectrometry --- Analytical chemistry
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