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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 superc...

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Detalles Bibliográficos
Clasificación:Libro Electrónico
Autor principal: Hashimoto, Kenichiro (Autor)
Autor Corporativo: SpringerLink (Online service)
Formato: Electrónico eBook
Idioma:Inglés
Publicado: Tokyo : Springer Japan : Imprint: Springer, 2013.
Edición:1st ed. 2013.
Colección:Springer Theses, Recognizing Outstanding Ph.D. Research,
Temas:
Acceso en línea:Texto Completo

MARC

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245 1 0 |a Non-Universal Superconducting Gap Structure in Iron-Pnictides Revealed by Magnetic Penetration Depth Measurements  |h [electronic resource] /  |c by Kenichiro Hashimoto. 
250 |a 1st ed. 2013. 
264 1 |a Tokyo :  |b Springer Japan :  |b Imprint: Springer,  |c 2013. 
300 |a XIII, 125 p. 74 illus., 45 illus. in color.  |b online resource. 
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490 1 |a Springer Theses, Recognizing Outstanding Ph.D. Research,  |x 2190-5061 
505 0 |a 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. 
520 |a 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. 
650 0 |a Superconductivity. 
650 0 |a Superconductors. 
650 0 |a Quantum physics. 
650 0 |a Magnetism. 
650 1 4 |a Superconductivity. 
650 2 4 |a Quantum Physics. 
650 2 4 |a Magnetism. 
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950 |a Physics and Astronomy (R0) (SpringerNature-43715)