a-b Plane Anisotropy in YBCO
Abstract
The zero temperature in plane penetration depth in an untwinned single crystal of optimally doped YBa2Cu3O6.93 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 lambdaa(T)/lambdaa(0) and lambdab(T)/lambdab(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 CuO2 plane and none on the CuO chains but instead supports a more three dimensional models with interplane interactions.
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