Shear softening in tantalum at megabar pressures
Shear softening in tantalum at megabar pressures
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DOI：
10.1103/physrevb.82.132101
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发表时间：
2010-10-04
影响因子：
3.7
通讯作者：
Klepeis, John E.
中科院分区：
文献类型：
--
作者：
Antonangeli, Daniele;Farber, Daniel L.;Klepeis, John E.
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.
