Analysis on insulator�?�metal transition in yttrium doped LSMO from electron density distribution

Bulletin of materials science

R Renuretson¹  S Israel¹  R A J R Sheeba²  S Saravana Kumar¹  R Saravanan² 

[1] Department of Physics, The American College, Madurai 625 002, India$$Department of Physics, The American College, Madurai 625 002, IndiaDepartment of Physics, The American College, Madurai 625 002, India$$;Department of Physics, The Madura College, Madurai 625 011, India$$Department of Physics, The Madura College, Madurai 625 011, IndiaDepartment of Physics, The Madura College, Madurai 625 011, India$$

关键词: LSMO;    X-ray diffraction;    MEM;    charge density;    insulator â€�?? metal transition.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Yttrium doped LSMO (La_{1−ð�?��?}Sr_ð‘�?MnO₃) was prepared using solâ€�?�gel technique and analysed for the insulatorâ€�?�metal transition fromcharge density variation in the unit cell with respect to different stoichiometric inclusion of yttrium. X-ray powder diffraction profiles of the samples were obtained and the well known Rietveld method and a versatile tool called maximum entropy method (MEM) were used for structural and profile refinement. The charge density in the unit cell was constructed using refined structure factors and was analysed. The charge ordering taking place in the insulatorâ€�?�metal transition was investigated and quantified. The insulatorâ€�?�metal transition was found to occur when 20% of La/Sr atoms were replaced by yttrium. The changes in the charge environment have also been analysed.

【 授权许可】

Unknown