Abstract
Temperature dependences of the magnetization harmonics of YBa2Cu3O7 − x monodomain samples are studied experimentally at temperatures of 77–120 K. It is found that nonlinearity of magnetization of YBa2Cu3O7 − x (higher harmonics generation) is observed up to temperatures T = 103–112 K, which are much higher than the superconducting transition temperature of this compound. At the same temperatures, the temperature dependence of resistivity begins to deviate from linearity. The observed singularity of the magnetization of YBa2Cu3O7 − x is associated with the emergence of a pseudogap state in this compound.
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