Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements
(Sprache: Englisch)
This book shows that superconducting gap structure in iron-based superconductors depends on detailed electronic structure via magnetic penetration depth measurements, and that gap structure in iron-pnictides can be interpreted in the framework of A1g symmetry.
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This book shows that superconducting gap structure in iron-based superconductors depends on detailed electronic structure via magnetic penetration depth measurements, and that gap structure in iron-pnictides can be interpreted in the framework of A1g symmetry.
Klappentext zu „Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements “
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.
Inhaltsverzeichnis zu „Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements “
Introduction.- Superconducting Gap Structure and Magnetic Penetration Depth.- Iron-based Superconductors.- Experimental Method.- Superconducting Gap Structure and Quantum Critical Point in BaFe2(As1-xPx)2.- Superconducting Gap Nodes in the Zone-centered Hole Bands of KFe2As2.- Nodeless vs. Nodal Order Parameter in LiFeAs and LiFeP.- Conclusions.Autoren-Porträt von Kenichiro Hashimoto
Dr. Kenichiro Hashimoto Department of Physics, Kyoto University,
Kyoto, Japan
Bibliographische Angaben
- Autor: Kenichiro Hashimoto
- 2013, XIII, 125 Seiten, Maße: 16,6 x 23,5 cm, Gebunden, Englisch
- Verlag: Springer, Berlin
- ISBN-10: 4431542930
- ISBN-13: 9784431542933
Sprache:
Englisch
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