Universität zu Köln

Andersen, Lionel, Ramires, Aline ORCID: 0000-0002-1949-363X, Wang, Zhiwei ORCID: 0000-0003-0182-2471, Lorenz, Thomas ORCID: 0000-0003-4832-5157 and Ando, Yoichi ORCID: 0000-0002-3553-3355 (2020). Generalized Anderson's theorem for superconductors derived from topological insulators. Sci. Adv., 6 (9). WASHINGTON: AMER ASSOC ADVANCEMENT SCIENCE. ISSN 2375-2548

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Abstract

A well-known result in unconventional superconductivity is the fragility of nodal superconductors against nonmagnetic impurities. Despite this common wisdom, Bi2Se3 -based topological superconductors have recently displayed unusual robustness against disorder. Here, we provide a theoretical framework that naturally explains what protects Cooper pairs from strong scattering in complex superconductors. Our analysis is based on the concept of superconducting fitness and generalizes the famous Anderson's theorem into superconductors having multiple internal degrees of freedom with simple assumptions such as the Born approximation. For concreteness, we report on the extreme example of the Cu-x(PbSe)(5)(BiSe3)(6) superconductor. Thermal conductivity measurements down to 50 mK not only give unambiguous evidence for the existence of nodes but also reveal that the energy scale corresponding to the scattering rate is orders of magnitude larger than the superconducting energy gap. This provides the most spectacular case of the generalized Anderson's theorem protecting a nodal superconductor.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Andersen, Lionel UNSPECIFIED UNSPECIFIED UNSPECIFIED Ramires, Aline UNSPECIFIED orcid.org/0000-0002-1949-363X UNSPECIFIED Wang, Zhiwei UNSPECIFIED orcid.org/0000-0003-0182-2471 UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Ando, Yoichi UNSPECIFIED orcid.org/0000-0002-3553-3355 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-346234
DOI:	10.1126/sciadv.aay6502
Journal or Publication Title:	Sci. Adv.
Volume:	6
Number:	9
Date:	2020
Publisher:	AMER ASSOC ADVANCEMENT SCIENCE
Place of Publication:	WASHINGTON
ISSN:	2375-2548
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language STATES Multiple languages Multidisciplinary Sciences Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/34623