Lifshitz transitions and elastic properties of osmium under pressure
Lifshitz transitions and elastic properties of osmium under pressure
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DOI：
10.1103/physrevb.74.214103
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发表时间：
2006-07
影响因子：
3.7
通讯作者：
D. Koudela;M. Richter;A. Mobius;K. Koepernik;H. Eschrig
中科院分区：
文献类型：
--
作者：
D. Koudela;M. Richter;A. Mobius;K. Koepernik;H. Eschrig
费米面在压力作用下的拓扑变化可能会导致低温弹性性质的反常。我们对元素Os的密度泛函计算表明，这种金属在70到130美元的压力范围内经历了三次这样的Lifshitz相变。然而，相关的弹性异常是看不见的微弱的。这些临界压力大大超过了最近测得和计算出的压力的反常值，与六方晶格参数比$c/a的关系接近于$25.规则{0.3em}{0ex}}.我们证明了后一种异常在统计上并不显著，并且$(c/a)$$(P)$可以用光滑的相关性进行同样好的拟合。
Topological changes of the Fermi surface under pressure may cause anomalies in 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 and $130\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. 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 $25\phantom{\rule{0.3em}{0ex}}\mathrm{GPa}$. We demonstrate that the latter anomalies are statistically not significant and that $(c∕a)$ $(P)$ can be fitted equally well by a smooth dependence.