Structural, transport, magnetic properties and Raman spectroscopy of orthorhombic Y1-xCaxMnO3 (0 ≤ x ≤ 0.5)

被引：37

作者：

Iliev, MN ^{[1
]}

Lorenz, B

Litvinchuk, AP

Wang, YQ

Sun, YY

Chu, CW

机构：

[1] Univ Houston, Texas Ctr Superconduct & Adv Mat, Houston, TX 77204 USA

[2] Univ Houston, Dept Phys, Houston, TX 77204 USA

[3] Lawrence Berkeley Lab, Berkeley, CA 94720 USA

[4] Hong Kong Univ Sci & Technol, Hong Kong, Hong Kong, Peoples R China

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2005年 / 17卷 / 21期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1088/0953-8984/17/21/026

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Orthorhombic Y1-xCaxMnO3 (0 <= x <= 0.5) was prepared, and the variations with x of its structural, magnetic and electrical properties and the polarized Raman spectra were investigated. The lattice parameters change systematically with x. Although there are strong indications for increasing disorder above x = 0.20, the average structure remains orthorhombic in the whole substitutional range. Ca doping increases the conductivity, but the temperature dependence of resistivity rho(T) remains semiconducting for all x. The average magnetic exchange interaction changes from antiferromagnetic for x < 0.08 to ferromagnetic for x > 0.08. The evolution with x of the Raman spectra provides evidence for an increasingly disordered oxygen sublattice at x >= 0.10, presumably due to quasistatic and/or dynamical Jahn Teller distortions.

引用

页码：3333 / 3341

页数：9

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