Roles of high-frequency optical phonons in the physical properties of the conductive delafossite PdCoO2

被引：73
|
作者：
Takatsu, Hiroshi [1 ]
Yonezawa, Shingo
Mouri, Shinichiro
Nakatsuji, Satoru
Tanaka, Koichiro
Maeno, Yoshiteru
机构：
[1] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan
[2] Univ Tokyo, Inst Solid State Phys, Chiba 2778581, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2007年 / 76卷 / 10期
关键词：
PdCoO2; delafossite; anisotropic transport; specific heat; polarized Raman spectroscopy; infrared absorption; optical phonon;
D O I：
10.1143/JPSJ.76.104701
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We report physical properties of the conductive oxide PdCoO2 in the layered delafossite structure through measurements of the electrical resistivity, specific heat, magnetic susceptibility, polarized Raman spectra and infrared absorption. We observed two prominent Raman peaks at 520 and 712 cm(-1). The presence of these high frequency optical phonons is essential to explain the temperature dependence of the specific heat and the resistivity. No sign of superconductivity was detected in electrical resistivity and AC susceptibility down to 15 mK.
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页数：7
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