Lifshitz transitions and elastic properties of Osmium under pressure

Details Lifshitz transitions and elastic properties of Osmium under pressure Lifshitz transitions and elastic properties of Osmium under pressure

2006-07-13

arxiv.org/abs/cond-mat/0607329v2

Phys. Rev. B 74, 214103 (2006)

Physics

Condensed Matter

Materials Science

8 pages, 8 figures

Scientific paper

10.1103/PhysRevB.74.214103

Topological changes of the Fermi surface under pressure may cause anomalies in the low-temperature elastic properties. Our density functional calculations for elemental Osmium evidence that this metal undergoes three such Lifshitz transitions in the pressure range between 70 GPa and 130 GPa. The related elastic anomalies are, however, invisibly weak. The critical pressures considerably exceed the values for recently measured and calculated anomalies in the pressure (P) dependence of the hexagonal c/a lattice parameter ratio close to 25 GPa. We demonstrate that the latter anomalies are statistically not significant and that (c/a)(P) can be fitted equally well by a smooth dependence.

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