PRESSURE-DEPENDENCE OF THE ELASTIC-CONSTANTS OF CR+0.3 ATMOSPHERIC-PERCENT RU NEAR THE COMMENSURATE-INCOMMENSURATE SPIN-DENSITY WAVE TRANSITION

被引:8
作者
ALBERTS, HL [1 ]
FORD, PJ [1 ]
RAHDI, H [1 ]
SAUNDERS, GA [1 ]
机构
[1] UNIV BATH,SCH PHYS,BATH BA2 7AY,AVON,ENGLAND
关键词
D O I
10.1088/0953-8984/4/11/008
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
The hydrostatic pressure dependences of the elastic stiffnesses c11 and c(L) = (c11 + c12 + 2c44)/2 for a Cr + 0.3 at.% Ru alloy have been determined in the pressure range up to 1.5 kbar and at several fixed temperatures between 248 K and 298 K. This temperature region spans the antiferromagnetic incommensurate (I)-commensurate (C) spin density wave (SDW) transition. At room temperature both c11 and c(L) soften under pressure in a similar manner to that seen in the ferromagnetic Invar material Fe72Pt28. By contrast, for a Cr + 5 at.% V alloy, which remains paramagnetic at all temperatures, the elastic constants are found to increase slightly with pressure. Below room temperature, (partial-derivative-c11/partial-derivative-p) and (partial-derivative-c(L)/partial-derivative-p) for the Cr + 0.3 at.% Ru alloy exhibit rapid increases over a narrow pressure range together with hysteresis behaviour. Such features are characteristic of a first-order CSDW-ISDW transition at T(IC). The observations suggest that Cr + 0.3 at.% Ru is an antiferromagnetic Invar material.
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页码:2793 / 2799
页数:7
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