منابع مشابه
Novel high pressure structures and superconductivity of CaLi2.
Using evolutionary methodology for crystal structure prediction, we explore high-pressure phases of CaLi2, a compound made of two elements that show anomalies upon compression. In addition to the known low-pressure Laves phases, we find two novel structures with space groups C2/c and P2{1}/c, stable at pressure ranges of 35-54 GPa and 54-105 GPa, respectively. It is found that decomposition int...
متن کاملHigh-pressure crystal structures and superconductivity of Stannane (SnH4).
There is great interest in the exploration of hydrogen-rich compounds upon strong compression where they can become superconductors. Stannane (SnH(4)) has been proposed to be a potential high-temperature superconductor under pressure, but its high-pressure crystal structures, fundamental for the understanding of superconductivity, remain unsolved. Using an ab initio evolutionary algorithm for c...
متن کاملLattice dynamics and superconductivity in cerium at high pressure.
We have measured phonon dispersion relations of the high-pressure phase cerium-oC4 (α' phase with the α-uranium crystal structure) at 6.5 GPa by using inelastic x-ray scattering. Pronounced phonon anomalies are observed, which are remarkably similar to those of α-U. First-principles electronic structure calculations reproduce the anomalies and allow us to identify strong electron-phonon couplin...
متن کاملMgB2: superconductivity and pressure effects
The Ginzburg-Landau theory is presented for a two-band superconductor with emphasis on MgB2. Experiments are proposed which lead to identification of the possible scenarios: whether both σand π-bands superconduct or σ-alone. According to the second scenario a microscopic theory of superconducting MgB2 is proposed based on the strongly interacting σ-electrons and non-correlated π-electrons of bo...
متن کاملSuperconductivity under high pressure in the binary compound CaLi2
Feng et al. predicted for CaLi2 highly anomalous properties with possible superconductivity under very high pressures, including for the hcp polymorph a significant lattice bifurcation at pressures above 47 GPa. More recently, however, Feng suggested that for pressures exceeding 20 GPa CaLi2 may dissociate into elemental Ca and Li. Here we present for hcp CaLi2 measurements of the electrical re...
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ژورنال
عنوان ژورنال: THE REVIEW OF HIGH PRESSURE SCIENCE AND TECHNOLOGY
سال: 1993
ISSN: 0917-639X,1348-1940
DOI: 10.4131/jshpreview.2.200