ANOMALOUS BEHAVIOR OF THE 147 CM(-1) CU(2) RAMAN MODE IN YBA2CU4O8 UNDER HIGH-PRESSURE - SIGNATURE OF CHANGE IN THE ELECTRONIC-STATE OF THE CUO2 PLANE

被引：10

作者：

KAKIHANA, M

ARASHI, H

YASHIMA, M

YOSHIMURA, M

BORJESSON, L

KALL, M

机构：

[1] TOHOKU UNIV,FAC ENGN,DEPT MACHINE INTELLIGENCE & SYST ENGN,AOBA KU,SENDAI,MIYAGI 980,JAPAN

[2] ROYAL INST TECHNOL,DEPT PHYS,S-10044 STOCKHOLM,SWEDEN

[3] CHALMERS UNIV TECHNOL,DEPT PHYS,S-41296 GOTHENBURG,SWEDEN

来源：

PHYSICA C | 1994年 / 230卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)90464-2

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effect of pressure on Raman modes of ceramic superconducting samples of YBa2Cu4O8 has been investigated up to 16 GPa at room temperature. While frequencies of the modes at 101, 250, 310, 339, 500 and 605 cm(-1) increase almost linearly with increasing pressure, the mode at 147 cm(-1) corresponding to the z-motion of Cu(2) atoms in the CuO2 plane exhibited a nonlinearity at pressure exceeding 6 GPa. A correlation is observed between the pressure-induced changes in T-c and the change in the frequency of the Cu(2) mode. We propose that the anomalous nonlinear behaviour of the Cu(2) mode in the high pressure regime is a signature of changes in the electronic state of the CuO2 plane resulting from a charge carrier redistribution between Cu(2) and O(2/3) in the conducting CuO2 plane.

引用

页码：199 / 206

页数：8

共 52 条

[1] CORRELATION BETWEEN THE MAGNITUDE OF THE SUPERCONDUCTING TRANSITION-TEMPERATURE AND THE NORMAL-STATE MAGNETIC-SUSCEPTIBILITY IN BI2SR2CACU2O8+Y AND TL2BA2CUO6+Y AS A FUNCTION OF OXYGEN-CONTENT [J].