Magnetic field-induced transitions in La0.42Eu0.25Ca0.33MnO3 perovskite manganite

被引：13

作者：

Turpu, Goverdhan Reddy ^{[1
,2
]}

Gupta, Ajay ^{[2
]}

Reddy, K. Rama ^{[1
]}

机构：

[1] Osmania Univ, Dept Phys, Hyderabad 500007, Andhra Pradesh, India

[2] UGC DAE Consortium Sci Res, Indore 452001, Madhya Pradesh, India

来源：

JOURNAL OF PHYSICS D-APPLIED PHYSICS | 2009年 / 42卷 / 14期

关键词：

TRANSPORT-PROPERTIES; EU-151; MOSSBAUER; RESISTIVITY; CROSSOVER;

D O I：

10.1088/0022-3727/42/14/145004

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Electrical and magnetic transport properties of polycrystalline La0.42Eu0.25Ca0.33MnO3 manganite perovskite are reported here. Temperature dependence of electrical transport, in 0 and 0.6 T external magnetic fields, shows insulating behaviour down to the lowest measured temperatures. Application of 6 T external magnetic field induces two different transitions: (1) an insulator-metal transition around 110 K and (2) a low temperature upturn in resistance values at 30 K. These field-induced transitions suggest strong competition between various interactions present in these materials; this is further supported by the observation of hysteresis in electrical resistance in thermal cooling and warming cycles of measurement. The observed upturn in resistance values below 30 K is presumably due to the combined effect of weak localization, electron-electron and electron-phonon scattering. Magnetization measurements show a paramagnetic-AFM transition at 50 K, but a deviation from a straight line in the 1/M versus T is observed well above 170 K. These results manifest the competition between various possible interactions present in the system.

引用

页数：6

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