Evidence of magnetic mechanism for cuprate superconductivity

Details Evidence of magnetic mechanism for cuprate superconductivity Evidence of magnetic mechanism for cuprate superconductivity

2009-09-05

arxiv.org/abs/0909.1040v1

New J. Phys. 11 065006 (2009)

Physics

Condensed Matter

Superconductivity

17 pages, 13 figures

Scientific paper

A proper understanding of the mechanism for cuprate superconductivity can emerge only by comparing materials in which physical parameters vary one at a time. Here we present a variety of bulk, resonance, and scattering measurements on the (Ca_xLa_{1-x})(Ba_{1.75-x}La_{0.25+x})Cu_3O_y high temperature superconductors, in which this can be done. We determine the superconducting, Neel, glass, and pseudopage critical temperatures. In addition, we clarify which physical parameter varies, and, equally important, which does not, with each chemical modification. This allows us to demonstrate that a single energy scale, set by the superexchange interaction J, controls all the critical temperatures of the system. J, in-turn, is determined by the in plane Cu-O-Cu buckling angle.

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