Kohn anomaly in MgB2 by inelastic X-ray scattering -: art. no. 197004

被引：66

作者：

Baron, AQR

Uchiyama, H

Tanaka, Y

Tsutsui, S

Ishikawa, D

Lee, S

Heid, R

Bohnen, KP

Tajima, S

Ishikawa, T

机构：

[1] JASRI, SPring 8, Mikazuki, Hyogo 6795198, Japan

[2] ISTEC, Superconduct Res Lab, Tokyo 1350062, Japan

[3] RIKEN, SPring 8, Mikazuki, Hyogo 6795148, Japan

[4] Forschungszentrum Karlsruhe, Inst Festkorperphys, D-76021 Karlsruhe, Germany

[5] Kyoto Univ, Kyoto 6068501, Japan

来源：

PHYSICAL REVIEW LETTERS | 2004年 / 92卷 / 19期

基金：

日本学术振兴会;

关键词：

D O I：

10.1103/PhysRevLett.92.197004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study phonons in MgB2 using inelastic x-ray scattering (1.6 and 6 meV resolution). We clearly observe the softening and broadening of the crucial E-2g mode through the Kohn anomaly along GammaM, in excellent agreement with ab initio calculations. Low temperature measurements ( just above and below T-c) show negligible changes for the momentum transfers investigated and no change in the E-2g mode at A between room temperature and 16 K. We report the presence of a longitudinal mode along GammaA near in energy to the E-2g mode that is not predicted by theory.

引用

页码：197004 / 1

页数：4

共 37 条

[1] SUPERCONDUCTIVITY AND PHONON SOFTENING .2. LEAD ALLOYS [J].