Shear softening in tantalum at megabar pressures | INSTITUT DE PHYSIQUE DU GLOBE DE PARIS

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  Shear softening in tantalum at megabar pressures

Type de publication:

Journal Article

Source:

Physical Review B, Volume 82, Ticket 13 (2010)

ISBN:

1098-0121

Numéro d'accès:

ISI:000282421900001

URL:

http://prb.aps.org/abstract/PRB/v82/i13/e132101

Mots-clés:

UMR 7154 ; Minéralogie

Résumé:

We have experimentally and theoretically investigated the aggregate elasticity of tantalum to pressures exceeding 1 Mbar. Our inelastic x-ray scattering measurements show a softening in the aggregate shear velocity in the 90-100 GPa range with typical pressure dependence above 120 GPa. Our calculations suggest that, in analogy with theoretical predictions on vanadium and niobium, this anomalous behavior is likely due to the intraband nesting of the Fermi surface that leads to an electronic topological transition and a concomitant transverse-acoustic-phonon mode softening.

Notes:

Antonangeli, Danièle Farber, Daniel L. Said, Ayman H. Benedetti, Laura Robin Aracne, Chantel M. Landa, Alexander Soederlind, Per Klepeis, John E.