The Misfit Strain Critical Point in the 3D Phase Diagrams of Cuprates

Details The Misfit Strain Critical Point in the 3D Phase Diagrams of Cuprates The Misfit Strain Critical Point in the 3D Phase Diagrams of Cuprates

2008-12-04

arxiv.org/abs/0812.0951v3

Physics

Condensed Matter

Superconductivity

12 pages and 2 figures

Scientific paper

10.1007/s10948-008-0435-8

At the time of writing, data have been reported on several hundred different cuprates materials, of which a substantial fraction show superconductivity at temperatures as high as 130 K. The existence of several competing phases with comparable energy shows up in different ways in different materials, therefore it has not been possible to converge toward a universal theory for high Tc superconductivity. With the aim to find a unified description the Aeppli-Bianconi 3D phase diagram of cuprates has been proposed where the superlattice misfit strain (eta) is the third variable beyond doping (delta) and temperature T. The 3D phase diagrams for the magnetic order, and for the superconducting order extended to all cuprates families are described. We propose a formula able to describe the Tc (delta,eta) surface, this permits to identify the stripe quantum critical point at (delta)c=1/8 and (eta)c =7percent which is associated with the incommensurate to commensurate stripe phase transition, controlled by the misfit strain.

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