Experimental investigation of the origin of the cross-over temperature in the cuprates

Physics – Condensed Matter – Strongly Correlated Electrons

Scientific paper

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4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.020505

We investigate the cross-over temperature T* as a function of doping in (Ca_{x}La_{1-x})(Ba_{1.75-x}La_{0.25+x})Cu_3O_{y}, where the maximum Tc (Tc^max) 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 TN^max 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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