摘要
采用固相法制备了样品La0.3Ca0.7Mn0.96W0.04O3. 通过测量样品的M-T曲线、 M-H曲线和ESR曲线, 研究了La0.3Ca0.7Mn0.96W0.04O3的磁性质. 结果表明： 在265 K时形成电荷有序相（CO相）. 当T＞265 K时, 表现为顺磁;当T＜225 K时, 表现为长程反铁磁（在AFM本底中存在少量FM成分）, 形成少量FM相与AFM/CO相共存;从265～225 K, 随温度降低在电荷有序态下从顺磁向反铁磁转变. 测量了La0.3Ca0.7Mn0.96W0.04O3样品的ESR谱线宽, 样品的顺磁共振线宽ΔHPP的值随着温度的降低是增加的, 表明随着温度的降低样品的铁磁关联增强.
The sample La0.3 Cao.7 Mn0.96 W0.04 03 was prepared by the solid-state method. Magnetic properties of Lao.3Cao.7Mno.96Wo.0403 was studied through the measurement of M-T curve, M-H curves and ESR curves of the sample. The results show that： charge ordering （CO） phase forms at 265 K; the system exhibits paramagnetism when T 〉 265 K; it exhibits long-range anti-ferromagnetism （there is a little FM component in AFM background） and the coexistence of a little FM phase and AFM/CO phase forms when T 〈 225 K; the system transforms from paramagnetism to antiferromagnetism in charge-ordering state with temperature decreasing from 265 to 225 K. The width of ESR spectrum line of the sample Lao.3 Cao.7Mno.96 W0.0403 was measured, and the values of the line width of paramagnetic resonance AHpp increase with temperature decreasing, which indicates that ferromagnetic connection of the sample strengthens with temperature decreasing.
出处
《稀有金属》
EI
CAS
CSCD
北大核心
2006年第5期635-638,共4页
Chinese Journal of Rare Metals
基金
国家自然科学基金重点项目(19934003)
国家重点基础研究发展规划项目(001CB610604)
安徽省高等学校自然科学研究项目(2005KJ234)资助
宿州学院教授(博士)科研启动基金项目(2006jb02)
