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| La0.3Ca0.7Mn1-xWxO3体系电荷有序的建立与融化 | |
| 引用本文： | 蔡之让,郭焕银,刘宁,张裕恒.La0.3Ca0.7Mn1-xWxO3体系电荷有序的建立与融化[J].光谱学与光谱分析,2007,27(2):223-227. |
| 作者姓名： | 蔡之让 郭焕银 刘宁 张裕恒 |
| 作者单位： | 1. 宿州学院材料研究室,安徽,宿州,234000 2. 宿州学院材料研究室,安徽,宿州,234000;中国科学技术大学结构分析开放实验室,安徽,合肥,230026 3. 中国科学技术大学结构分析开放实验室,安徽,合肥,230026 |
| 基金项目： | 国家自然科学基金 , 国家重点基础研究发展计划(973计划) , 宿州学院教授基金 |
| 摘 要： | 用标准的固相反应法制备了La0.3Ca0.7Mn1-xWxO3(0.00≤X≤0.15)多晶样品.通过对样品磁化强度-温度(M-T)曲线、磁化强度-磁场强度(MH)曲线及ESR谱的测量,研究了Mn位W掺杂对La0.3Ca0.7Mn1-xWxO3体系的磁相变的影响.结果表明,随着W掺杂量的增加,体系磁相变发生了复杂的变化过程.当掺杂量为0.00≤X≤0.08时,体系存在电荷有序(CO)相,反铁磁(AFM)/C0态共存于相变温度以下,电荷有序温度(Tco)随着W掺杂量的增加而增加.x≥0.12时,体系电荷有序态逐渐减弱并融化,在极低温度下存在顺磁-铁磁(PM-FM)相变. |
| 关 键 词： | 凝聚态物理 磁相变 电荷有序 建立 融化 稀土 |
| 文章编号： | 1000-0593（2007）02-0223-05 |
| 收稿时间： | 2005-12-05 |
| 修稿时间： | 2006-03-20 |
Establishment and Melting of Charge Ordering in La0.3 Ca0.7 Mn1-xWxO3 System |
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| CAI Zhi-rang,GUO Huan-yin,LIU Ning,ZHANG Yu-heng.Establishment and Melting of Charge Ordering in La0.3 Ca0.7 Mn1-xWxO3 System[J].Spectroscopy and Spectral Analysis,2007,27(2):223-227. | |
| Authors: | CAI Zhi-rang GUO Huan-yin LIU Ning ZHANG Yu-heng |
| Institution: | 1. Materials Research Laboratory, Suzhou College, Suzhou 234000, China 2. Structure Research Laboratory, University of Science and Technology of China, Hefei 230026, China |
| Abstract: | Polycrystalline samples of La0.3Ca0.7Mn(1-x)W(x)O3 (0.00 < or = x < or = 0.15) were prepared by conventional solid-state reaction method. The influence of W doping at Mn site on the magnetic transition of La0.3Ca0.7Mn(1-x)W(x)O3 system was studied by the measurements of magnetization-temperature (MT) curves, magnetization-magnetic intensity (MH) curves, and ESR spectra. The results show that, with the increase in W doping amount, the magnetic transition of the system exhibits a complicated charge process, when the doping amount is 0.00 < or = x < or = 0.08, the charge-ordering (CO) phase exists in the system, AFM/CO states coexist below the transition temperature, and the charge-ordering temperature (Tco) goes up with the increase in W doping content; when x > or = 0.12, the charge ordering (CO) state of the system weakens and melts, and paramagnetism-ferromagnetism (PM-FM) transition exists at extremely low temperature. |
| Keywords: | Condensed matter physics Magnetic transition Charge ordering Establishment Melting Rare earths |
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