Relation between magnetic entropy and resistivity in La0.67Ca0.33MnO3

被引：70

作者：

Xiong, CM ^{[1
]}

Sun, JR

Chen, YF

Shen, BG

Du, J

Li, YX

机构：

[1] Chinese Acad Sci, State Key Lab Magnetism, Inst Phys, Beijing 100080, Peoples R China

[2] Chinese Acad Sci, State Key Lab Magnetism, Ctr Condensed Matter Phys, Beijing 100080, Peoples R China

[3] Hebei Univ Technol, Sch Mat Sci & Engn, Tianjin 300130, Peoples R China

来源：

IEEE TRANSACTIONS ON MAGNETICS | 2005年 / 41卷 / 01期

基金：

中国国家自然科学基金;

关键词：

magnetic entropy; magnetic polarons; magnetoresistance; manganite film;

D O I：

10.1109/TMAG.2004.840132

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We present an investigation of the magnetic entropy DeltaS and resistivity rho, and the relation between them, for La0.67Ca0.33MnO3 film. We found that the maximum DeltaS is approximately 6 J/kg(.)K, and the maximum magnetoresistance (defined as rho(0)/rho(H) - 1) is about 400% under a field mu(o)H of 5 T. A careful analysis gives an equation of the form DeltaS = -alpha integral(o)(H) [partial derivative ln(rho) / partial derivativeT] (H)dH (alpha = 21.74 emu/g), which relates magnetic order to transport behavior of the compounds. This result reveals the predominant role of magnetic polarons on the magnetoresistive property of manganites. It also provides an alternative method to determine magnetic entropy change on the basis of resistive measurements.

引用

页码：122 / 124

页数：3

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