Abstract
The large anisotropies observed in the in-plane transport properties of untwinned single crystals of YBa 2 Cu 3 O 6.95 reside in the orthorhombic nature of its band structure which includes CuO chains as well as CuO 2 planes. An infinite band model with distinct effective mass in a and b-direction is used to study the a.c. conductivity of a d-wave BCS superconductor. A subdominant s-wave admixture is also included in the gap because both symmetries belong to the same irreducible representation in an orthorhombic system. Parameters are fit to experimental data.
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Schürrer, I., Schachinger, E. & Carbotte, J.P. Optical Conductivity in Orthorhombic d-Wave Superconductors. Journal of Low Temperature Physics 115, 251–280 (1999). https://doi.org/10.1023/A:1021879520432
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DOI: https://doi.org/10.1023/A:1021879520432