Overview
- Presents studies on the superconducting gap structure in the recently discovered iron-based superconductors
- Provides a detailed description of experimental principles and methods for the magnetic penetration measurements including the tunnel diode oscillator and microwave cavity perturbation techniques
- Investigates the non-universal superconducting gap structure with and without nodes in iron-pnictides
- Nominated as an outstanding Ph.D thesis by Kyoto University’s Physics Department in 2011
- Includes supplementary material: sn.pub/extras
Part of the book series: Springer Theses (Springer Theses)
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Table of contents (8 chapters)
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Front Matter
Keywords
About this book
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, whichmay address a key question on the general phase diagram of unconventional superconductivity in the vicinity of a QCP.
Authors and Affiliations
About the author
Dr. Kenichiro Hashimoto
Department of Physics, Kyoto University,
Kyoto, Japan
Bibliographic Information
Book Title: Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
Authors: Kenichiro Hashimoto
Series Title: Springer Theses
DOI: https://doi.org/10.1007/978-4-431-54294-0
Publisher: Springer Tokyo
eBook Packages: Physics and Astronomy, Physics and Astronomy (R0)
Copyright Information: Springer Japan 2013
Hardcover ISBN: 978-4-431-54293-3Published: 27 February 2013
Softcover ISBN: 978-4-431-56334-1Published: 23 August 2016
eBook ISBN: 978-4-431-54294-0Published: 12 February 2013
Series ISSN: 2190-5053
Series E-ISSN: 2190-5061
Edition Number: 1
Number of Pages: XIII, 125
Topics: Strongly Correlated Systems, Superconductivity, Quantum Physics, Magnetism, Magnetic Materials