TY - BOOK ID - 19376565 TI - Fermi Surface and Quantum Critical Phenomena of High-Temperature Superconductors PY - 2017 SN - 3319486454 3319486462 PB - Cham : Springer International Publishing : Imprint: Springer, DB - UniCat KW - Quantum physics. KW - Electronic materials. KW - Strongly Correlated Systems, Superconductivity. KW - Quantum Physics. KW - High temperature superconductors KW - Physics. KW - Superconductivity. KW - Superconductors. KW - Optical materials. KW - Optical and Electronic Materials. KW - Structure. KW - Materials at low temperatures KW - Superconductors KW - Quantum theory. KW - Optics KW - Materials KW - Quantum dynamics KW - Quantum mechanics KW - Quantum physics KW - Physics KW - Mechanics KW - Thermodynamics KW - Electronic materials KW - Superconducting materials KW - Superconductive devices KW - Cryoelectronics KW - Electronics KW - Solid state electronics KW - Electric conductivity KW - Critical currents KW - Superfluidity UR - https://www.unicat.be/uniCat?func=search&query=sysid:19376565 AB - This thesis provides a detailed introduction to quantum oscillation measurement and analysis and offers a connection between Fermi surface properties and superconductivity in high-temperature superconductors. It also discusses the field of iron-based superconductors and tests the models for the appearance of nodes in the superconducting gap of a 111-type pnictide using quantum oscillation measurements combined with band structure calculation. The same measurements were carried out to determine the quasiparticle mass in BaFe2(As1-xPx)2, which is strongly enhanced at the expected quantum critical point. While the lower superconducting critical field shows evidence of quantum criticality, the upper superconducting critical field is not influenced by the quantum critical point. These findings contradict conventional theories, demonstrating the need for a theoretical treatment of quantum critical superconductors, which has not been addressed to date. The quest to discover similar evidence in the cuprates calls for the application of extreme conditions. As such, quantum oscillation measurements were performed under high pressure in a high magnetic field, revealing a negative correlation between quasiparticle mass and superconducting critical temperature. ER -