On conduction mechanism in paramagnetic phase of Gd based manganites

Bulletin of materials science

S Sagar²  M R Anantharaman¹ 

[1] Department of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$Department of Physics, Cochin University of Science and Technology, Cochin 682 022, IndiaDepartment of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$;Department of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$Department of Physics, Govt. Polytechnic College, Adoor 691 523, India$$Department of Physics, Cochin University of Science and Technology, Cochin 682 022, IndiaDepartment of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$Department of Physics, Govt. Polytechnic College, Adoor 691 523, India$$Department of Physics, Govt. Polytechnic College, Adoor 691 523, IndiaDepartment of Physics, Cochin University of Science and Technology, Cochin 682 022, India$$Department of Physics, Govt. Polytechnic College, Adoor 691 523, India$$

关键词: Manganite;    conduction mechanism;    small polaron hopping;    variable range hopping.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Materials belonging to the family of manganites are technologically important since they exhibit colossal magneto resistance. A proper understanding of the transport properties is very vital in tailoring the properties. A heavy rare earth doped manganite like Gd_0.7Sr_0.3MnO₃ is purported to be exhibiting unusual properties because of smaller ionic radius of Gd. Gd_0.7Sr_0.3MnO₃ is prepared by a wet solid state reaction method. The conduction mechanism in such a compound has been elucidated by subjecting the material to low temperature d.c. conductivity measurement. It has been found that the low band width material follows a variable range hopping (VRH) model followed by a small polaron hopping (SPH) model. The results are presented here.

【 授权许可】

Unknown