General model of pressure-induced transition temperature increase with focus on the Hg-Ba-Ca-Cu-O System

摘要

A general calculation of high pressure induced transition temperature (T c)increases for oxide superconductors gives a good description for theHg-Ba-Ca-Cu-O system. Predictions are made of the maximum T^ cP theo =163, 154,and 111K compared with T^ cP exp = 164, 154, and 118K respectively for thesuperconducting phases of Hg-1223, Hg-1212, and Hg-1201 as a function of theircompressibilities agreeing with experiment. The theoretical result is in theform of a universal scaling equation for the fractional change in T c as afunction of pressure, which is derived from a recent phenomenological theory ofshort coherence length superconductivity.