Conventional and unconventional impurity effects in superconductors (Review Article)

Автор(и)

  • Yu.G. Pogorelov IFIMUP-IN, Departamento de Física e Astronomia, Universidade do Porto, Porto, Portugal
  • V.M. Loktev Bogolyubov Institute for Theoretical Physics, NAN of Ukraine, 14b Metrologichna Str., Kiev 03143, Ukraine

DOI:

https://doi.org/10.1063/1.5020892

Ключові слова:

impurity effects, superconductor, electronic spectra.

Анотація

A survey is done on the effects of impurities in different types of superconductors, both conventional and unconventional, on their electronic spectra and physical properties. These effects can be generally divided on the base of validity (or not) for them of the known Anderson theorem, which is determined by the symmetries of the superconducting state vs those of the impurity perturbation. In this regard, the unconventional behavior can be naturally attributed to this theorem’s failure when the impurity effects are generally much stronger and more diverse. Specific forms of such perturbations in different superconducting systems are analyzed and they reveal a variety of possible scenarios for quasiparticle spectra modification, including formation of several superconducting phases, distinguished by the types of specific narrow bands within the main spectrum gap. These phases and transitions between them, including the transition to the normal metal state, present a lot of unconventional features that can be of interest for some practical applications. The concluded observable effects are compared to the available experimental data.

Завантаження

Дані завантаження ще не доступні.

Downloads

Опубліковано

2017-11-21

Як цитувати

(1)
Pogorelov, Y.; Loktev, V. Conventional and Unconventional Impurity Effects in Superconductors (Review Article):. Fiz. Nizk. Temp. 2017, 44, 3-35.

Номер

Розділ

Статті

Статті цього автора (авторів), які найбільше читають

<< < 1 2 3 4 5 6