RAMAN MODE ASSIGNMENTS OF HGBA2CUO4+DELTA CRYSTALLITES

被引：14

作者：

LEE, HG

SHIN, HS

YANG, IS

YU, JJ

HUR, NH

机构：

[1] EWHA WOMANS UNIV,DEPT PHYS,SEOUL 120750,SOUTH KOREA

[2] SOGANG UNIV,DEPT PHYS,SEOUL 121742,SOUTH KOREA

[3] KOREA RES INST STAND & SCI,TAEJON 305606,SOUTH KOREA

来源：

PHYSICA C | 1994年 / 233卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)00517-6

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We have studied the Raman modes in HgBa2CuO4+delta crystallites through polarized Raman measurements. The Raman peaks at 158 and 592 cm(-1) are assigned to be the Ba A(1g) mode and the O(2) A(1g) mode respectively. This is in reasonable agreement with the results of LDA total-energy phonon calculations of HgBa2CuO4+delta. To clarify symmetry and site assignment for the mode near 570 cm(-1), we studied its behavior at elevated temperatures. Together with a thermogravimetric analysis (TGA), it is found that the 570 cm(-1) mode is not related to the O(3) 'interstitial' oxygen as suggested by some authors. However, the polarization dependence of the 570 cm(-1) mode shows no conclusive sign of E(g) symmetry contrary to our previous speculation.

引用

页码：35 / 39

页数：5

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