RAMAN-STUDY OF CRITICAL FLUCTUATIONS NEAR THE PHASE-TRANSITION IN FERROELECTRIC LI2GE7O15

被引：3

作者：

SHITOV, GY ^{[1
]}

TIMONIN, PN ^{[1
]}

TORGASHEV, VI ^{[1
]}

LATUSH, LT ^{[1
]}

YUZYUK, YI ^{[1
]}

VOLNYANSKII, MD ^{[1
]}

机构：

[1] DNEPROPETROVSK STATE UNIV,DEPT ELECTROPHYS,DNEPROPETROVSK 320625,UKRAINE

来源：

PHASE TRANSITIONS | 1994年 / 46卷 / 03期

关键词：

CRITICAL FLUCTUATIONS; RENORMALIZATION GROUP; SOFT MODE; CENTRAL PEAK; RAMAN SPECTRA;

D O I：

10.1080/01411599408200320

中图分类号：

O7 [晶体学];

学科分类号：

0702 ; 070205 ; 0703 ; 080501 ;

摘要：

The anomalous behavior of the soft mode in the Raman spectra of the Li2Ge7O15 polar phase has been found to be in good agreement with renormalization group (RG) theoretical results in the short-range scaling region 7 < T-c - T < 43 K. The values and the temperature dependence of the dimensionless critical susceptibility, the order parameter correlation lengths along the orthorhombic axes and the bare soft phonon damping constant have been obtained along with the scaling indexes nu = 0.631 +/- 0.002, gamma = 1.23 +/- 0.03 and the Ginzburg parameter Gi approximate to 0.41 from a least-squares fit of the RG Formula to the Raman data.

引用

页码：143 / 161

页数：19

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