Specific heat and transport properties of La1−xGdxMnO3 at
- 作者：Renu Choithrani ; N.K. Gaur ; R.K. Singh
- 关键词：A. Manganites ; A. CMR materials ; D. Transport properties ; D. Specific heat
- 刊名：Solid State Communications
- 出版年：2008
- 期刊代码：101_00381098
- 类别：ms
- 出版时间：July 2008
- 卷：147
- 期：3-4
- 页码：103-106
- 文件大小：345 K
摘要
We have investigated the specific heat and transport properties of the doped perovskite manganites La1−xGdxMnO3 with 0.0≤x≤1.0 in the temperature range 
using the Modified Rigid Ion Model (MRIM), probably, for the first time. At room temperature, for all doping levels the orthorhombic ‘O’ phase is indicative of a strong Jahn–Teller distortion. Our theoretical results on the specific heat for La1−xGdxMnO3 (x=0.0, 0.75 and 1.0) as a function of temperature 
are closer to the available experimental data with minor deviations at lower and higher temperatures. The MRIM results have predicted the observed anomalies for x=0.0, 0.75, 1.0 in the temperature range 
and revealed new anomalies for x=0.25 and 0.50 in the temperature range 
. Further, we have computed the temperature and composition (x) dependence of the transport properties, like the cohesive energy (
), Restrahalen frequency (υ0), Debye temperature (θD) and Grüneisen parameter (γ) and compared them with the experimental data available only at room temperature (300 K) for the concentrations x=0.0 and 1.0.
), Restrahalen frequency (υ0), Debye temperature (θD) and Grüneisen parameter (γ) and compared them with the experimental data available only at room temperature (300 K) for the concentrations x=0.0 and 1.0.