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首页> 外文期刊>Solid State Communications >On the coexistance of spin and lattice polarons in the La0.67-xEuxCa0.33MnO3CMR system
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On the coexistance of spin and lattice polarons in the La0.67-xEuxCa0.33MnO3CMR system

机译：关于La0.67-xEuxCa0.33MnO3CMR系统中自旋极化子和晶格极化子的共存

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摘要

The electrical and magnetic transport properties of the La0.67-xEuxCa0.33MnO3 system exhibit lowering of insulator to metal and paramagnetic to ferrornagnetic transition temperature (T-C) with the increase of Eu concentration in addition to posses sing CMR property. The temperature variation of electrical resistivity and magnetic susceptibility for x=0.21 is found to have two distinct regions in the paramagnetic state for T > T-p:, one with the localization of lattice polaron in the high-temperature region (T > 1.5T(p)) satisfying the dynamics of variable range hopping (VRH) model and the other being, the combination of the spin and lattice polarons in the region T-p < T < 1.5T(p). The resistivity variation with temperature and magnetic field, the cusp in the resistivity peak and CMR phenomenon are interpreted in terms of coexistence of spin and lattice small polarons in the intermediate region (T-p < T < 1.5T(p)). The spin polaron energy in the La0.46Eu0.21Ca0.33MnO3 system is estimated to be 106.73 +/- 0.90 meV and this energy decreases with the increase of external magnetic field. The MR ratio is maximal with a value of 99.99% around the transition temperature and this maximum persists till T --> 0 K. at the field of 8 T. (C) 2004 Elsevier Ltd. All rights reserved.
机译：La0.67-xEuxCa0.33MnO3系统的电和磁输运性质除了具有CMR性质外，还随着Eu浓度的增加而降低了绝缘体向金属的转化以及顺磁向F的转变。对于x = 0.21，电阻率和磁化率的温度变化在T> Tp的顺磁状态下有两个不同的区域：一个在高温区域中晶格极化子局部化（T> 1.5T（p ））满足动态范围跳变（VRH）模型的动力学要求，另一个是Tp 0K。（C）2004 Elsevier Ltd.保留所有权利。

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