Superconductivity in the β-pyrochlore osmatesстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Brühwiler M. ,
Schulze T. ,
Kazakov S.M. ,
Bukowski Z. ,
Puzniak R. ,
Zhigadlo N.D. ,
Karpinski J. ,
Batlogg B.
Журнал:
Physica C: Superconductivity and its Applications
Том:
460
Номер:
SPEC. ISS.
Год издания:
2007
Издательство:
Elsevier BV
Местоположение издательства:
Netherlands
Первая страница:
62
Последняя страница:
65
DOI:
10.1016/j.physc.2007.03.376
Аннотация:
To elucidate the effect of the mass renormalization on the superconducting state in AOs 2O 6, we have performed thermodynamic and transport measurements on K xRb 1-xOs 2O 6 with x = 0-1. We show that KOs 2O 6 (RbOs 2O 6) is an intermediate to strong-coupling superconductor with a coupling parameter λ ep ≈ 1.2 (λ ep ≈ 1). Quantifying λ ep allows us to determine the mass enhancement over the calculated band electronic density of states in addition to the electron-phonon term. We correlate the additional enhancement with the upper critical field slope which is determined by orbital magnetism. In the normal state, the charge carriers scatter at a low-energetic phonon. This rattling motion appears as an Einstein contribution with three modes per Rb in the RbOs 2O 6 specific heat data, suggesting the rattler being the alkali-ion. © 2007 Elsevier B.V. All rights reserved.
Добавил в систему:
Казаков Сергей Михайлович