Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
Authors: Hashimoto, Kenichiro
- 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
書籍の購入
- この書籍について
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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.
- 著者について
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Dr. Kenichiro Hashimoto
Department of Physics, Kyoto University,
Kyoto, Japan
- Download Sample pages 2 PDF (282.4 KB)
- Download Table of contents PDF (159.3 KB)
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書誌情報
- Bibliographic Information
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- Book Title
- Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
- Authors
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- Kenichiro Hashimoto
- Series Title
- Springer Theses
- Copyright
- 2013
- Publisher
- Springer Japan
- Copyright Holder
- Springer Japan
- イーブック ISBN
- 978-4-431-54294-0
- DOI
- 10.1007/978-4-431-54294-0
- ハードカバー ISBN
- 978-4-431-54293-3
- ソフトカバー ISBN
- 978-4-431-56334-1
- Series ISSN
- 2190-5053
- Edition Number
- 1
- Number of Pages
- XIII, 125
- Topics
