| La2/3(Ca,Ba)1/3MnO3系统的顺磁共振研究 |
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| 引用本文： | 彭刚,袁松柳,金嗣昭.La2/3(Ca,Ba)1/3MnO3系统的顺磁共振研究[J].无机材料学报,2003,18(1):169. |
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| 作者姓名： | 彭刚 袁松柳 金嗣昭 |
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| 作者单位： | 1. 华中科技大学物理系; 武汉 420074; 2. 中国科技大学结构分析中心 合肥 230026 |
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| 基金项目： | 国家自然科学基金，教育部跨世纪优秀人才培养计划 |
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| 摘 要： | 报道了对La2/3Ca1/3MnO3和La2/3Ba1/3MnO3系统不同温度下的电子顺磁共振(EPR)实验研究,当温度高于某一特征温度Tmin时,共振线宽随温度降低而线性变窄;当温度低于Tmin时,共振线宽表现出反常展宽.基于“瓶颈(bottleneck)”自旋-晶格弛豫模型我们对这种行为进行了讨论,并且指出A位离子平均半径强烈影响着自旋-晶格交换作用和自旋-自旋相互作用的强弱.
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| 关 键 词： | 顺磁共振 共振线宽 瓶颈模型 超大磁电阻效应 |
| 收稿时间： | 2001-11-21 |
| 修稿时间： | 2002-04-19 |
Electron Paramagnetic Resonance Measurements of La2/3 (Ca,Ba) 1/3MnO3 |
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| PENG Gang,YUAN Song-Liu,JIN Si-Zhao.Electron Paramagnetic Resonance Measurements of La2/3 (Ca,Ba) 1/3MnO3[J].Journal of Inorganic Materials,2003,18(1):169. |
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| Authors: | PENG Gang YUAN Song-Liu JIN Si-Zhao |
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| Affiliation: | 1. Institute of Material Physics and Department of Physics; Huazhong University of Science & Technology; Wuhan 430074; China; 2. Structure Analysis Cente; University of Science and Technology of China; Hefei 230026; China |
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| Abstract: | The electron paramagnetic resonance spectra of La2/3Ca1/3MnO3 and La2/3Ba1/3MnO3 were measured at various temperatures. It is show that there exists a temperature T min by which the conventional paramagnetic region of T>Tc is divided into two different temperature ranges, T>Tmin and Tcmin. At T>Tmin, the peak-to-peak linewidth ΔHpp as a function of temperature shows a linear decrease on cooling, while at Tmin, ΔHpp is anomalously increased on further cooling. The results can be explained by the “bottleneck” spin-lattice relaxation model. The average A-site ionic size A> affects strongly the interaction of the spin-lattice and spin-spin. |
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| Keywords: | EPR linewidth bottleneck model CMR |
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