Pressure dependence of TC of the layered superconductor Y2C2I2:: lattice versus electronic effects

被引：6

作者：

Ahn, K

Grzechnik, A

Kremer, RK

Simon, A

Marshall, WG

机构：

[1] Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany

[2] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2003年 / 171卷 / 1-2期

关键词：

superconductivity; layered superconductors; rare-earth carbide halides; pressure dependence; bulk modulus; equation of state; neutron powder diffraction; X-ray powder diffraction;

D O I：

10.1016/S0022-4596(02)00214-1

中图分类号：

O61 [无机化学];

学科分类号：

070301 [无机化学]; 081704 [应用化学];

摘要：

The response to application of pressure of the crystal structure of the 10 K layered rare-earth carbide halide superconductor Y2C2I2 is studied. We find an anisotropic response with largest compression perpendicular to the metal atom layers. From the decrease of the cell volume with pressure the equation of state is established using a bulk modulus of 37(1) GPa. It is concluded that the large increase of T-C with pressure (1/T(C)dT(C)/dP = 0.13(1) GPa(-1)) is due to a growth of the electronic density of states with pressure for which a value of 1/N(E-F)dN(E-F)/dP to approximate to 0.12 states/eV GPa is estimated. (C) 2003 Elsevier Science (USA). All rights reserved.

引用

页码：367 / 370

页数：4

共 32 条

[1]

The layered lanthanum carbide halide superconductors La2C2(X,X′)2 (X,X′ = Cl, Br, I):: Neutron powder diffraction characterization and electronic properties [J].