Abstract
Single crystals untwinned optimally doped YBa2Cu3O9.65 show a large degree of anisotropy in a-b plane properties such as resistivity, infrared conductivity and value of zero temperature penetration depth. This source of orthorhombicity must ultimately reside in the CuO chains. Using a three plane model; 2 CuO2 and one CuO (chain plane), we study solutions of three coupled BCS equations which include inter- as well as intra-plane coupling. The gaps are found to contain s- as well as d-wave symmetries. From our solutions, we calculate the penetration depth and compare with experiments.
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