THERMODYNAMICAL PROPERTIES OF INCOMMENSURATE MAGNETIC SYSTEMS

被引：19
|
作者：
BLANCO, JA
GIGNOUX, D
MORIN, P
SCHMITT, D
机构：
[1] Laboratoire de Magnétisme Louis Néel, CNRS, Grenoble Cedex, 38042
[2] Universidad de Cantabria, Santander
来源：
EUROPHYSICS LETTERS | 1991年 / 15卷 / 06期
关键词：
MAGNETIC PHASE BOUNDARIES (INC MAGNETIC TRANSITIONS; METAMAGNETISM; ETC); CRITICAL-POINT EFFECTS; SPECIFIC HEATS; SHORT-RANGE ORDER;
D O I：
10.1209/0295-5075/15/6/019
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
A thermodynamical analysis of second-order magnetic transitions in commensurate and incommensurate magnetic systems within a mean-field theory is presented. New and original results are obtained concerning the specific heat of amplitude-modulated magnetic structures; especially the specific-heat discontinuity at the ordering temperature T(N) is reduced by a factor of 2/3 with regard to that expected in ferro- or helimagnetic structures. In addition, under certain conditions, the maximum of specific heat at T(N) is shifted to a temperature below T(N). Recent experimental data on GdCu2Si2 and GdNi2Si2 compounds support quite well these peculiarities.
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页码：671 / 676
页数：6
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