| Texto completo | |
| Autor(es): |
Andersen, Lionel
[1]
;
Ramires, Aline
[2, 3, 4]
;
Wang, Zhiwei
[1]
;
Lorenz, Thomas
[1]
;
Ando, Yoichi
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Cologne, Phys Inst 2, D-50937 Cologne - Germany
[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden - Germany
[3] Univ Estadual Paulista, Inst Fis Teor, BR-01140070 Sao Paulo, SP - Brazil
[4] ICTP SAIFR, BR-01140070 Sao Paulo, SP - Brazil
Número total de Afiliações: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SCIENCE ADVANCES; v. 6, n. 9 FEB 2020. |
| Citações Web of Science: | 0 |
| Resumo | |
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. (AU) | |
| Processo FAPESP: | 16/01343-7 - ICTP Instituto Sul-Americano para Física Fundamental: um centro regional para física teórica |
| Beneficiário: | Nathan Jacob Berkovits |
| Modalidade de apoio: | Auxílio à Pesquisa - Projetos Especiais |
| Processo FAPESP: | 18/18287-8 - Novos métodos teóricos para o entendimento e optimização de fases emergentes da matéria em materiais complexos |
| Beneficiário: | Aline Ramires Neves de Oliveira |
| Modalidade de apoio: | Bolsas no Brasil - Jovens Pesquisadores |