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Elasticity of the superconducting metals V, Nb, Ta, Mo, and W at high pressure
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2008 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 77, no 21Article in journal (Refereed) Published
Abstract [en]

First-principles calculations have been performed for V, Nb, Ta, Mo, and W. The recently discovered bcc -> rhombohedral transition for vanadium [Phys. Rev. Lett. 98, 085502 (2007)] was confirmed as the mechanical instability of c(44) was found at P=80 GPa. Furthermore, the c(11), c(12), and c(44) constants for the group-V elements showed erratic behaviors whereas the constants for the group-VI elements were monotonically increasing with pressure. The metals were analyzed with Fermi surface calculations, showing shrinking nesting vectors with pressure for V, Nb, and Ta but were not seen for Mo and W. From electronic topological transition contributions, a critical energy closely situated to the Fermi level for vanadium could be the reason why the elastic constants of V and Nb were difficult to reproduce at ambient pressure.

Place, publisher, year, edition, pages
2008. Vol. 77, no 21
Keyword [en]
vanadium single-crystals, temperature-dependence, transition-metals, lattice-dynamics, thermal-expansion, constants, hydrogen, moduli, anomalies, tantalum
Identifiers
URN: urn:nbn:se:kth:diva-17660DOI: 10.1103/PhysRevB.77.214101ISI: 000257288900022Scopus ID: 2-s2.0-44649195909OAI: oai:DiVA.org:kth-17660DiVA: diva2:335704
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2017-12-12Bibliographically approved

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