Abnormal temperature dependence of elastic properties of cuprates superconductors
نویسنده
چکیده
In cuprates superconductors (as polycrystal and single crystal samples) unusual hysteretic temperature behavior of elastic properties is frequently observed. In this work from the uniform point of view detailed analysis this abnormal temperature behavior of elastic properties is given. It is shown that the hysteretic temperature dependencies of elastic properties of YBa2Cu3O7−δ crystal are strongly anisotropic and are connected to hysteretic behavior of the C3333 modulus while the C1111 and C2222 moduli have no such dependence. The analysis of the elastic constant tensor on the basis of the microscopic model has allowed to draw a conclusion, that the hysteretic behavior of the C3333 modulus of YBa2Cu3O7−δ crystal is caused by temperature dependent renormalization of constants of interaction of apex oxygen atoms with copper atoms and are connected apparently to formation of charge ordering.
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