NMR analysis of the electronic structure of superconducting yttrium carbide halides

被引：11

作者：

Herrling, E

Dormann, E ^{[1
]}

Henn, RW

Kremer, RK

Simon, A

机构：

[1] Univ Karlsruhe, Inst Phys, D-76128 Karlsruhe, Germany

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

来源：

SYNTHETIC METALS | 1998年 / 92卷 / 01期

关键词：

nuclear magnetic resonance spectroscopy; spin-lattice relaxation; layered carbide halides; superconductors;

D O I：

10.1016/S0379-6779(98)80016-7

中图分类号：

T [工业技术];

学科分类号：

08 [工学];

摘要：

Nuclear magnetic resonance and relaxation are reported for C-13, Br-79/81 and I-127 in the layered carbide halides Y2C2Br2, Y2C2Br0.5I1.5, Y2C2I2 and Y2CBr2 for natural isotope abundances and for C-13-enriched samples, Field and temperature dependences of C-13 spin-lattice relaxation are derived. The data analysis supports p-like character of the conduction electrons at the C-2 dumbbell sites in the superconducting dicarbides. Nonlinear temperature dependence of the C-13 Korringa rate in Y2C2Br2 indicates that the Fermi energy falls in a region of positive curvature of the energy-dependent density of states. (C) 1998 Elsevier Science S.A.

引用

页码：13 / 16

页数：4

共 7 条

[1]

Bulk superconductivity at 10 K in the layered compounds Y2C2I2 and Y2C2Br2 [J].