Inhomogeneous ²⁰⁵Tl  NMR line broadening in Tl₂Ba₂CuO_x single crystals.

  Abstract:
Temperature and angular dependences of  ²⁰⁵Tl line width, D_1/2 , and transverse relaxation time, t , have been measured in two crystals of Tl₂Ba₂CuO_x with T_c=32 and 115K, respectively. In the normal state both D_1/2 and t have been found to be temperature - independent and not to vary with varying T_c, implying that the size of inhomogeneous broadening originates, most probably, from local distortions associated with Cu substitution for Tl. A conclusion is that variations in T_c are not related to this substitution.