ULTRASONIC AND NEUTRON-DIFFRACTION STUDIES OF DILUTE CR-RE AND CR-RU ALLOY SINGLE-CRYSTALS

被引：24
|
作者：
BOSHOFF, AH
ALBERTS, HL
DUPLESSIS, PD
VENTER, AM
机构：
[1] Dept. of Phys., Rand Afrikaans Univ., Aucklandpark
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 1993年 / 5卷 / 30期
关键词：
D O I：
10.1088/0953-8984/5/30/015
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
Measurements are reported on the temperature dependence of the elastic constants of dilute Cr-Ru and Cr-Re alloy single crystals, containing respectively 0.3 at.% Ru, 0.5 at.% Ru, 0.3 at.% Re and 0.5 at.% Re. Neutron diffraction experiments were also performed on the two Cr-Ru crystals. Well defined anomalies were observed in all the elastic constants as well as in the integrated neutron intensities at the magnetic phase transitions of the alloys. The commensurate (c) spin density wave (SDW) to paramagnetic (p) and incommensurate (I) SDW to P transitions are second-order phase transitions, while the ISDW-CSDW and CSDW-ISDW transitions are of first order. A thermodynamic model describes the temperature dependence of the magnetic contributions (DELTAB) to the bulk modulus (B) reasonably well, but fails to give the observed relationship between DELTAB and the magnetization.
引用
收藏
页码：5353 / 5370
页数：18
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