Superconductivity in layered binary silicides: A density functional theory study

被引：24

作者：

Flores-Livas, Jose A. ^{[1
,2
]}

Debord, Regis ^{[1
,2
]}

Botti, Silvana ^{[1
,2
,3
]}

San Miguel, Alfonso ^{[1
,2
]}

Pailhes, Stephane ^{[1
,2
,4
]}

Marques, Miguel A. L. ^{[1
,2
]}

机构：

[1] Univ Lyon, FR-69000 Lyon, France

[2] Univ Lyon 1, LPMCN, CNRS, UMR 5586, FR-69622 Villeurbanne, France

[3] Ecole Polytech, CNRS, CEA DSM, Lab Solides Irradies & ETSF, FR-91128 Palaiseau, France

[4] CEA CNRS, Inst Rayonnement Matiere Saclay, Lab Leon Brillouin, CE Saclay,UMR 12, FR-91191 Gif Sur Yvette, France

来源：

PHYSICAL REVIEW B | 2011年 / 84卷 / 18期

关键词：

HIGH-PRESSURE; PHASE-TRANSITIONS; SILICON; CASI2; TEMPERATURE; MGB2; SR;

D O I：

10.1103/PhysRevB.84.184503

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A class of metal disilicides (of the form XSi2, where X is a divalent metal) crystallizes in the EuGe2 structure, formed by hexagonal corrugated silicon planes intercalated with metal atoms. These compounds are superconducting like other layered superconductors, such as MgB2. Moreover, their properties can be easily tuned either by external pressure or by negative chemical pressure (i.e., by changing the metal), which makes disilicides an ideal testbed to study superconductivity in layered systems. In view of this, we present an extensive density functional theory study of the electronic and phonon band structures as well as the electron-phonon interaction of metal disilicides. Our results explain the variation of the superconducting transition temperature with pressure and the species of the intercalating atom, and allow us to predict superconductivity for compounds not yet synthesized belonging to this family.

引用

页数：7

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