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

TL;DR

This study explores the doping dependence of the crossover temperature T* in cuprate superconductors, revealing its magnetic origin and the influence of three-dimensional interactions through systematic susceptibility measurements.

Contribution

It provides experimental evidence linking T* to the maximum Neel temperature, suggesting a magnetic origin and the role of 3D interactions in cuprates.

Findings

T* scales with the maximum Neel temperature TN^max.

T* is determined by DC-susceptibility measurements.

Supports a magnetic origin of the crossover temperature.

Abstract

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.