Comparative study of Tl-2201 single crystals with different temperatures of superconducting transition by means of specific heat method.

 Abstract:
 The comparison studies of the specific heat of Tl-2201 single crystals with the different oxygen concentration have led to the conclusion that the doping by oxygen, resulting in lowering of T_c and increasing of number of paramagnetic centers, leads to diminishing of antiferromagnetic correlations contribution to the specific heat.