a-b Plane Anisotropy in YBCO

Details a-b Plane Anisotropy in YBCO a-b Plane Anisotropy in YBCO

1996-04-16

arxiv.org/abs/cond-mat/9604104v1

Physics

Condensed Matter

To appear in the proceeding of the BICAS Summer School on ``Symmetry of the Order Parameter in High-Temperature Superconductor

Scientific paper

The zero temperature in plane penetration depth in an untwinned single crystal of optimally doped YBa_2Cu_3O_6.93 is highly anisotropic. This fact has been interpreted as evidence that a large amount of the condensate resides in the chains. On the other hand, the temperature dependence of lambda_a(T)/lambda_a(0) and lambda_b(T)/lambda_b(0) (where the b-direction is along the chains) are not very different. This constrains theories and is, in particular, difficult to understand within a proximity model with d-wave pairing only in the CuO_2 plane and none on the CuO chains but instead supports a more three dimensional models with interplane interactions.

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