TRICRITICAL BEHAVIOR IN UNIAXIALLY STRESSED RBCAF3

被引：91
作者：
BUZARE, JY [1 ]
FAYET, JC [1 ]
BERLINGER, W [1 ]
MULLER, KA [1 ]
机构：
[1] LAB SPECTROSCOPIE SOLIDE,F-72017 LE MANS,FRANCE
来源：
PHYSICAL REVIEW LETTERS | 1979年 / 42卷 / 07期
关键词：
D O I：
10.1103/PhysRevLett.42.465
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We have investigated the Oh1 to D4h18 structural phase transition in RbCaF3 under near-[100] stress, by monitoring the electron-paramagnetic resonance lines of Gd3+ (S=72) on a Ca2+ site. We find that the first-order transition at zero stress becomes second order at t=1.90.3 kg/mm2 and Tt=195.30.1 K. At this tricritical point, and up to =4.80.3 kg/mm2, the exponent of the temperature dependence of the rotational order parameter is =0.180.02. © 1979 The American Physical Society.
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页码：465 / 468
页数：4
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