A magnetic analog of the isotope effect in cuprates
Rinat Ofer, Galina Bazalitsky, Amit Kanigel, Amit Keren, Assa Auerbach, James S. Lord, Alex Amato
Abstract
We present extensive magnetic measurements of the (CaxLa1-x)(Ba1.75-xLa0.25+x)Cu3Oy (CLBLCO) system with its four different families (x) having a Tcmax(x) variation of 28% and minimal structural changes. For each family we measured the Neel temperature, the anisotropies of the magnetic interactions, and the spin glass temperature. Our results exhibit a universal relation Tc=c*J*ns for all families, where c~1, J is the in plane Heisenberg exchange, and ns is the carrier density. This relates cuprate superconductivity to magnetism in the same sense that phonon mediated superconductivity is related to atomic mass.
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