The pressure dependence of the superconducting transition temperature of LaT4P12(T = Fe, Ru, Os)

L. E. DeLong, G. P. Meisner

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70 Scopus citations

Abstract

The superconducting transition temperature, Tc, of the LaT4P12 compounds with T = Fe, Ru, or Os has been measured under hydrostatic pressure P up to 1.8 GPa. The T = Fe compound exhibits a substantial increase of Tc from Tc (P = 0) = 4.1 K at a rate (dTc/dP)P=0= +7.2 x 10-1 K/GPa. In contrast, the Ru and Os compounds exhibit only weak decreases of Tc from Tc (P = 0) = 7.2 K and 1.8 K with (dTc/dP)P=0= -1.6 x 10-1 K/GPa and -9.5 x 10-2 K/GPa, respectively. An analysis of this strikingly divergent behavior of Tc(P) in terms of the structural characteristics of the RT4X12 class of compounds where R = rare earth element, T = Fe, Ru, or Os, and X = P, As, or Sb suggests that Tc(P) for these materials consists of two competing contributions: a depression of Tc due to the compression of the lattice (i.e., decrease in volume), and an enhancement of Tc due to the effect of pressure on La itself.

Original languageEnglish
Pages (from-to)119-123
Number of pages5
JournalSolid State Communications
Volume53
Issue number2
DOIs
StatePublished - Jan 1985

Bibliographical note

Funding Information:
Acknowledgments - We thank Sally Fisher for assistance in performing the pressure measurements. Informative discussions with Drs. R. C. Albers, A. M. Boring, A. L. Giorgi, and Professor D. K. Wohlleben. The work at LANL was performed under the auspices of the U.S. Department of Energy.

Funding

Acknowledgments - We thank Sally Fisher for assistance in performing the pressure measurements. Informative discussions with Drs. R. C. Albers, A. M. Boring, A. L. Giorgi, and Professor D. K. Wohlleben. The work at LANL was performed under the auspices of the U.S. Department of Energy.

FundersFunder number
Michigan State University-U.S. Department of Energy (MSU-DOE) Plant Research Laboratory
Los Alamos National Laboratory

    ASJC Scopus subject areas

    • General Chemistry
    • Condensed Matter Physics
    • Materials Chemistry

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