Spatial anisotropy of anomalous acoustic damping and thermal conductivity in La2MCuO4 high-temperature superconductors

Low-temperature thermal properties of superconductors have been studied. It is shown that the symmetry group influences the thermal conductivity and the anomalous acoustic damping, and the directions of maximum thermal conductivity and acoustic damping factor are indicated. For crystals, the general conclusion is reached that the absence of a center of symmetry is a necessary condition for the existence of these properties.

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