Abstract
The low temperature heat capacity measurements on LSCO samples containing Zn impurities have been performed by means of pulsed differential calorimetry technique. The interpretation of the Zn-concentration dependence of the residual γ-coefficient in the linear temperature part of Cel(T) at T≪Tc is consistent with a model based on the assumption of the d-wave symmetry of the order parameter of these superconducting copper oxides.
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