| La5/6Li1/6MnO3的低频内耗研究 |
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| 引用本文： | 王广涛,张敏平,戴宪起,危书义,方前锋. La5/6Li1/6MnO3的低频内耗研究[J]. 河南师范大学学报(自然科学版), 2004, 32(4): 41-44 |
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| 作者姓名： | 王广涛 张敏平 戴宪起 危书义 方前锋 |
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| 作者单位： | 河南师范大学,物理与信息工程学院,河南,新乡,453007;中国科学院,固体物理研究所,合肥,230031 |
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| 基金项目： | 河南省高校青年骨干教师资助计划(2003140027) |
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| 摘 要： | 研究了样品La5/6Li1/6MnO3的内耗、直流电阻、交流磁化率.在75—245K的温度范围内,在0.3T的磁场下该样品有明显的磁阻(MR)效应.测量到两个电阻峰(Tp1=224K,Tp2=169K)和一个MR峰(T=218K).内耗(Q-1)测量中发现两个峰(PL=169K,PH=224K)和模量软化;并且内耗峰温与频率无关、内耗峰值与频率成反比.最终,提出在样品中存在相分离的观点.
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| 关 键 词： | 内耗 巨磁阻 相分离 |
| 文章编号： | 1000-2367(2004)04-0041-04 |
| 修稿时间： | 2004-04-27 |
Low frequency study phase separation in La5/6Li1/6MnO3 |
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| WANG Guang-tao,ZHANG Min-ping,DAI Xian -qi,WEI Shu-yi,FANG Qian-feng. Low frequency study phase separation in La5/6Li1/6MnO3[J]. Journal of Henan Normal University(Natural Science), 2004, 32(4): 41-44 |
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| Authors: | WANG Guang-tao ZHANG Min-ping DAI Xian -qi WEI Shu-yi FANG Qian-feng |
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| Affiliation: | WANG Guang-tao~1,ZHANG Min-ping~1,DAI Xian -qi~1,WEI Shu-yi~1,FANG Qian-feng~2 |
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| Abstract: | La_(5/6)Li_(1/6)MnO_3 has been studied with reference to the internal friction (Q~(-1)), electrical resistivity and AC magnetic susceptibility. Large magnetoresistance ratio (MR) exists in a wide range temperature (75-245 K) in La_(5/6)Li_(1/6)MnO_3 specimens at a small magnetic field (0.3 T). Two resistivity peaks (T_(p1)=224 K,T_(p2)=169 K) and a MR peak (T=218 K) are observed. Accompanied with the local minimum of elastic modulus, the internal friction measurement reveals two peaks at about 169 K and 224 K. The position of the peak in Q~(-1) does not shift with the frequency, while the height of the peak in Q~(-1) decreases with the frequency increase. From above experiments, we draw the conclusion that there is phase separation in the sample. |
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| Keywords: | internal friction magnetoresistance phase separation |
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