| Anisotropic microwave conductivity of cuprate superconductors in the presence of CuO chain induced impurities (2009) | |||||||||
Abstract | |||||||||
| The anisotropy in the microwave conductivity of the ortho-II YBa$_2$Cu$_3$O$_{6.50}$ is studied within the kinetic energy driven superconducting mechanism. The ortho-II YBa$_2$Cu$_3$O$_{6.50}$ is characterized by a periodic alternative of filled and empty $\hat{b}$-axis CuO chains. By considering the CuO chain induced extended anisotropy impurity scattering, the main features of the anisotropy in the microwave conductivity of the ortho-II YBa$_2$Cu$_3$O$_{6.50}$ are reproduced based on the nodal approximation of the quasiparticle excitations and scattering processes, including the intensity and lineshape of the energy and temperature dependence of the $\hat{a}$-axis and $\hat{b}$-axis microwave conductivities. Our results also confirm that the $\hat{b}$-axis CuO chain induced impurity is the main source of the anisotropy.. Comment: 6 pages, 3 figures | |||||||||
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