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Fermi Surface and Quantum Critical Phenomena of High-Temperature Superconductors (Paperback, Softcover reprint of the original 1st ed. 2017)
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Fermi Surface and Quantum Critical Phenomena of High-Temperature Superconductors (Paperback, Softcover reprint of the original 1st ed. 2017)
Series: Springer Theses
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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.
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