On conduction mechanism in paramagnetic phase of Gd based manganites

[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.

[学科分类] 材料工程

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