Thermal diffusivity of La1-xSrxMnO3 (x < 0.3)

被引：10
|
作者：
Salazar, A
Oleaga, A
Prabhakaran, D
机构：
[1] Univ Basque Country, Escuela Super Ingn, Dept Fis Aplicada, Bilbao 48013, Spain
[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England
来源：
INTERNATIONAL JOURNAL OF THERMOPHYSICS | 2004年 / 25卷 / 04期
关键词：
critical parameters; manganites; phase transitions; photopyroelectric; thermal diffusivity;
D O I：
10.1023/B:IJOT.0000038515.61986.65
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Perovskite manganites are interesting because of their colossal magnetoresistance. In this work high resolution thermal diffusivity measurements of La1-xSrxMnO3 (0 less than or equal to x less than or equal to 0.3) single crystals in the temperature range from 250 to 400 K are presented. A photopyroelectric device in the standard back configuration has been used. The thermal diffusivity through second-order magnetic phase transitions, as well as through first- and second-order structural phase transitions has been measured. The critical parameters of the sample with x = 0.3 at the ferromagnetic-to-paramagnetic transition have been obtained, and are close to the values predicted by the Ising model.
引用
收藏
页码：1269 / 1279
页数：11
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