Disorder and chain superconductivity in YBa_2Cu_3O_{7-δ}

Details Disorder and chain superconductivity in YBa_2Cu_3O_{7-δ} Disorder and chain superconductivity in YBa_2Cu_3O_{7-δ}

1998-10-16

arxiv.org/abs/cond-mat/9810199v2

Physical Review B 59, 3377 (1999)

Physics

Condensed Matter

Superconductivity

4 pages, 2 figures, submitted to PRB rapid communications

Scientific paper

10.1103/PhysRevB.59.3377

The effects of chain disorder on superconductivity in YBa_2Cu_3O_{7-\delta} are discussed within the context of a proximity model. Chain disorder causes both pair-breaking and localization. The hybridization of chain and plane wavefunctions reduces the importance of localization, so that the transport anisotropy remains large in the presence of a finite fraction $\delta$ of oxygen vacancies. Penetration depth and specific heat measurements probe the pair-breaking effects of chain disorder, and are discussed in detail at the level of the self-consistent T-matrix approximation. Quantitative agreement with these experiments is found when chain disorder is present.

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