Heat capacity and electric resistance of Sm0.55Sr0.45MnO3 manganite near Tc in a magnetic field of up to 26 kOe:: Fluctuation effects and colossal magnetoresistance development scenario

被引：8

作者：

Abdulvagidov, SB ^{[1
]}

Kamilov, IK ^{[1
]}

Aliev, AM ^{[1
]}

Batdalov, AB ^{[1
]}

机构：

[1] Russian Acad Sci, Dagestan Sci Ctr, Inst Phys, Makhachkala 367003, Dagestan, Russia

来源：

JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS | 2003年 / 96卷 / 04期

基金：

俄罗斯基础研究基金会;

关键词：

D O I：

10.1134/1.1574548

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The fluctuation effects in Sm0.55Sr0.45MnO3 manganite are quantitatively characterized and the colossal magnetoresistance (CMR) development scenario in this manganite near T-c is refined based on the results of high-precision measurements of the heat capacity and electric resistance in a broad range of temperatures (77-300 K) and magnetic fields (up to 26 kOe). The experiments revealed a new type of hysteresis related to a jumplike change in the critical temperature T-c due to the phase transition from the ferromagnetic to paramagnetic state. The influence of the order parameter fluctuations on the heat capacity of Sm0.55Sr0.45MnO3 was experimentally observed and quantitatively estimated for the first time. A fluctuation mechanism of CMR development near T-c is proposed. On approaching T-c in a strong magnetic field, the system exhibits a transition from one- to three-dimensional critical behavior. It is shown that, in the presence of a magnetic field, the behavior of microscopic ferromagnetic regions in Sm0.55Sr0.45MnO3 changes near T-c from static into dynamic. It is established that the CMR in this manganite exhibits an anisotropy depending on the mutual orientation of the applied magnetic field and the electric current passing through the sample. The electric resistance of Sm0.55Sr0.45MnO3 is adequately described within the framework of a double exchange model. (C) 2003 MAIK "Nauka/Interperiodica".

引用

页码：757 / 765

页数：9

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