Critical behavior of the thermal properties of KMnF3

被引:30
作者
Salazar, A.
Massot, M.
Oleaga, A.
Pawlak, A.
Schranz, W.
机构
[1] Univ Basque Country, Escuela Tecn Super Ingn, Dept Fis Aplicada 1, Bilbao 48013, Spain
[2] Adam Mickiewicz Univ Poznan, Inst Phys, PL-61614 Poznan, Poland
[3] Univ Vienna, Fac Phys, A-1090 Vienna, Austria
来源
PHYSICAL REVIEW B | 2007年 / 75卷 / 22期
关键词
D O I
10.1103/PhysRevB.75.224428
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
An ac photopyroelectric calorimeter has been used to simultaneously measure the specific heat, thermal conductivity, and thermal diffusivity around the antiferromagnetic to paramagnetic phase transition in KMnF3. It has been found that the critical exponent and the amplitude ratio of the thermal diffusivity are the same as those of the specific heat. Both values agree with the predictions of the three-dimensional Heisenberg model for isotropic magnets, although this transition is not only magnetic but also structural as well. The thermal conductivity shows a broad peak at the Neel temperature that could be related to a reduction of the phonon scattering by the spin fluctuation as the transition temperature is approached.
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页数:7
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