Experimental investigation of the origin of the cross-over temperature in the cuprates
Abstract
We investigate the cross-over temperature T* as a function of doping in (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy, where the maximum Tc (Tcmax) varies continuously by 30% between families (x) with minimal structural changes. T* is determined by DC-susceptibility measurements. We find that T* scales with the maximum Neel temperature TNmax of each family. This result strongly supports a magnetic origin of T*, and indicates that three dimensional interactions play a role in its magnitude.
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