CRITICAL-BEHAVIOR OF THERMAL-DIFFUSIVITY AND THERMAL-CONDUCTIVITY OF CR2O3 AT THE NEEL TRANSITION

被引：13

作者：

MARINELLI, M ^{[1
]}

MERCURI, F ^{[1
]}

ZAMMIT, U ^{[1
]}

PIZZOFERRATO, R ^{[1
]}

SCUDIERI, F ^{[1
]}

机构：

[1] INST ISOTOPE & MOLEC TECHNOL INST,R-3400 CLUJ NAPOCA,ROMANIA

来源：

PHYSICAL REVIEW B | 1994年 / 49卷 / 06期

关键词：

D O I：

10.1103/PhysRevB.49.4356

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The photopyroelectric technique has been used to study the critical behavior of thermal diffusivity and thermal conductivity of Cr2O3 at the antiferromagnetic-paramagnetic phase transition. Deviation from the conventional Van Hove theory has been observed and the results have been explained in terms of a uniaxial model (n = 1) with energy conservation and a nonconserved order parameter. A sharp dip, due to critical slowing down, is present in the thermal diffusivity while the thermal conductivity shows no anomaly in the critical region. A power-law fit with a background contribution and a term to correct for the thermal-diffusivity anomaly gives a critical exponent b = -0.09 +/- 0.02 and a critical amplitude ratio of U+/U- = 0.51.

引用

页码：4356 / 4359

页数：4

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