Журнал Экспериментальной и Теоретической Физики
НАЧАЛО | ПОИСК | ДЛЯ АВТОРОВ | ПОМОЩЬ      e
Общая информация о журнале
Золотые страницы
Адреса редакции
Содержание журнала
Сообщения редакции
Правила для авторов
Загрузить статью
Проверить статус статьи


ЖЭТФ, Том 144, Вып. 3, стр. 560 (Сентябрь 2013)
(Английский перевод - JETP, Vol. 117, No 3, p. 487, September 2013 доступен on-line на www.springer.com )

SUBGAP STATES IN DISORDERED SUPERCONDUCTORS
Skvortsov M.A., Feigel'man M.V.

Поступила в редакцию: 22 Мая 2013

DOI: 10.7868/S0044451013090095

DJVU (184.1K) PDF (323.6K)

Dedicated to the memory of Professor Anatoly Larkin} We revise the problem of the density of states in disordered superconductors. Randomness of local sample characteristics translates to the quenched spatial inhomogeneity of the spectral gap, smearing the BCS coherence peak. We show that various microscopic models of potential and magnetic disorder can be reduced to a universal phenomenological random order parameter model, whereas the details of the microscopic description are encoded in the correlation function of the order parameter fluctuations. The resulting form of the density of states is generally described by two parameters: the width Γ measuring the broadening of the BCS peak and the energy scale Γtail that controls the exponential decay of the density of subgap states. We refine the existing instanton approaches for determination of Γtail and show that they appear as limiting cases of a unified theory of optimal fluctuations in a nonlinear system. The application to various types of disorder is discussed.

 
Сообщить о технических проблемах