Metal-insulator transition, specific heat, and grain-boundary-induced disorder in Sm0.55Sr0.45MnO3

被引：45

作者：

Egilmez, M. ^{[1
]}

Chow, K. H. ^{[1
]}

Jung, J. ^{[1
]}

Fan, I. ^{[1
]}

Mansour, A. I. ^{[1
]}

Salman, Z. ^{[2
,3
]}

机构：

[1] Univ Alberta, Dept Phys, Edmonton, AB T6G 2G7, Canada

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[3] Rutherford Appleton Lab, ISIS Facil, Didcot OX11 0QX, Oxon, England

来源：

APPLIED PHYSICS LETTERS | 2008年 / 92卷 / 13期

基金：

加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1063/1.2904699

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The effects of the grain-boundary-induced lattice disorder on the resistivity, the magnetization, and the specific heat of a prototypical manganite Sm0.55Sr0.45MnO3 near half doping were investigated at temperatures near the metal-insulator transition. An increasing lattice disorder softens the magnetic phase transition from a first order phase transition into a second order transition. Furthermore, the peaks in the resistivity and specific heat are broaden and there is an increase in the charge-carrier scattering rates in the metallic and insulating states. The origin of these phenomena is discussed.

引用

页数：3

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