| 层状钙钛矿La1.2Sr1.8Cu0.04Mn1.96O7中的自旋玻璃态和输运性质 |
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| 引用本文： | 司继伟,曹庆琪,顾本喜,都有为.层状钙钛矿La1.2Sr1.8Cu0.04Mn1.96O7中的自旋玻璃态和输运性质[J].中国稀土学报,2005,23(6):723-726. |
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| 作者姓名： | 司继伟 曹庆琪 顾本喜 都有为 |
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| 作者单位： | 南京大学固体微结构国家实验室,江苏,南京,210093 |
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| 基金项目： | 国家重点基础研究项目（G1999064508）资助课题 |
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| 摘 要： | 用固相烧结的方法成功制备了层状钙钛矿锰氧化物La1.2Sr1.8Cu0.04Mn1.96O7西多晶样品。研究发现，在层状钙钛矿La1.2Sr1.8Mn1.96O7中，用Cu替代Mn对其磁、电的性质影响非常显著。随温度的降低样品表现出从顺磁（PM）到铁磁（FM）及自旋玻璃态（SG）等复杂的磁相变行为。电性测量表明，在整个观察的温区内都表现出绝缘体或半导体的性质。对电阻率．温度曲线进行拟合表明：在低温区采用变程跳跃模型和在高温区采用小极化子模型都得到了较好的线性关系。
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| 关 键 词： | 层状钙钛矿 自旋玻璃 磁电阻 变程跳跃 小极化子 稀土 |
| 文章编号： | 1000-4343（2005）06-0723-04 |
| 收稿时间： | 12 25 2004 12:00AM |
| 修稿时间： | 2004-12-252005-06-20 |
Spin-Glass State and Transport Property of Layered Perovskite La1.2Sr1.8Cu0.04Mn1.96O7 |
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| Si Jiwei,Cao Qingqi,Gu Benxi,Du Youwei.Spin-Glass State and Transport Property of Layered Perovskite La1.2Sr1.8Cu0.04Mn1.96O7[J].Journal of the Chinese Rare Earth Society,2005,23(6):723-726. |
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| Authors: | Si Jiwei Cao Qingqi Gu Benxi Du Youwei |
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| Institution: | National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China |
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| Abstract: | Polycrystallite of layered perovskite La_(1.2)Sr_(1.8)Cu_(0.04)Mn_(1.96)O_7 was synthesized by solid state reaction method.The result shows that the effect of Cu substitute for Mn on the magnetic and electrical properties of La_(1.2)Sr_(1.8)Mn_(1.96)O_7 is very obvious.With the temperature decreasing,the system undergoes a transition from paramagnetic(PM) to ferromagnetic(FM) and further to spin-glass(SG).Temperature dependence of resistivity indicates that the sample is insulator or semiconductor in the whole observed temperature range.Resistivity curve is fitted well by vary range hopping(VRH) model at low temperature and small polaron hopping(SPH) model at high temperature. |
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| Keywords: | layered perovskite spin-glass magnetoresistance vary range hopping small polaron hopping rare earths |
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