Calculated Nb superconducting transition temperature under hydrostatic pressure

A full-potential linear muffin-tin orbital method (FP-LMTO) based linear-response approach is used to calculate the electron-phonon coupling in Nb under hydrostatic pressure. The superconducting transition temperature T c is calculated using the Eliashberg equation. The calculated T c agrees nicely...

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Bibliographic Details
Published inHigh pressure research Vol. 17; no. 3-6; pp. 393 - 400
Main Authors Ostanin, S. A., Trubitsin, V. Yu, Savrasov, S. Yu, Alouani, M., Dreyssé, H.
Format Journal Article
LanguageEnglish
Published Taylor & Francis Group 01.08.2000
Subjects
High pressure
Superconductivity
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Summary:A full-potential linear muffin-tin orbital method (FP-LMTO) based linear-response approach is used to calculate the electron-phonon coupling in Nb under hydrostatic pressure. The superconducting transition temperature T c is calculated using the Eliashberg equation. The calculated T c agrees nicely with the experimental result at ambient pressure, but the agreement is only fair at high pressures. The T c measured anomaly at 60-70GPa is understood in terms of the 2.5 order Lifshitz transition and its origin is traced back to the qualitative changes in the Fermi surface topology.
ISSN:0895-7959
1477-2299
DOI:10.1080/08957950008245929