arXiv subjects

T. McMullen

Publications and source records attributed to T. McMullen.

2 recordsLinked to original sources

arXiv2001

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

A general calculation of high pressure induced transition temperature (T c) increases for oxide superconductors gives a good description for the Hg-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 the superconducting phases of Hg-1223, Hg-1212, and Hg-1201 as a function of their compressibilities agreeing with experiment. The theoretical result is in the form of a universal scaling equation for the fractional change in T c as a function of pressure, which is derived from a recent phenomenological theory of short coherence length superconductivity.

cond-mat.supr-con↗

arXiv2001

Predictions of pressure-induced transition temperature increase for a variety of high temperature superconductors

A wide variety of superconducting oxides are used to test a general model of high pressure induced transition temperature (T c) changes. The T c 's vary from a low of 24 K to a high of 164 K. Although the model is capable of predicting both increases and decreases in T c with pressure, only superconductors that exhibit an increase are considered at this time. Predictions are made of the maximum T^ cP theo for 15 super-conductors as a function of their compressibilities. The theoretical results generally agree well with experiment. This model of T c as a function of pressure is derived from a recent successful phenomenological theory of short coherence length superconductivity.

cond-mat.supr-con↗