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| 双掺杂La0.67+1.33xSr0.33-1.33xMn1-xMgxO3体系的磁性和输运行为 | |
| 引用本文： | 蔡之让,童伟,张勐,张贝,刘宁,张裕恒. 双掺杂La0.67+1.33xSr0.33-1.33xMn1-xMgxO3体系的磁性和输运行为[J]. 光谱学与光谱分析, 2005, 25(4): 481-486 |
| 作者姓名： | 蔡之让 童伟 张勐 张贝 刘宁 张裕恒 |
| 作者单位： | 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;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 |
| 基金项目： | 国家自然科学基金重点项目(10334090)和国家重点基础研究发展规划项目(001CB610604)资助 |
| 摘 要： | 用标准的固相反应法制备了双掺杂La0.67 1．33xSr0．33-1．33xMn1-xMgxO3(x=0．00，0．05，0．10，0．15，0．20，0．25)多晶样品，研究了它们的磁性和输运行为。对x=0．10和0．15，在温度高于Tc^cnset时出现相分离；对x=0．20和0．25，在低温区出现反铁磁行为。低掺杂样品ρ-T关系存在金属．绝缘体相变，高掺杂样品在测量温区内仅显示绝缘体行为。这些奇异现象用M-H关系、ESR曲线和拉曼光谱给予了很好的解释。 |
| 关 键 词： | 凝聚态物理 磁性 相分离 输运行为 稀土 |
| 文章编号： | 1000-0593(2005)04-0481-06 |
| 修稿时间： | 2004-08-08 |
Magnetic Properties and Transport Behaviors in Double Doped La0.67+1.33xSr0.33-1.33xMn1-xMgxO3 System |
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| CAI ZHI-RANG,TONG Wei,ZHANG Meng,ZHANG Bei,LIU Ning,ZHANG Yu-heng. Magnetic Properties and Transport Behaviors in Double Doped La0.67+1.33xSr0.33-1.33xMn1-xMgxO3 System[J]. Spectroscopy and Spectral Analysis, 2005, 25(4): 481-486 | |
| Authors: | CAI ZHI-RANG TONG Wei ZHANG Meng ZHANG Bei LIU Ning ZHANG Yu-heng |
| Affiliation: | Materials Research Laboratory, Suzhou College, Suzhou, China. |
| Abstract: | The M-T curves, M-H curves, ESR curves, infrared spectrum, Raman spectrum, rho-T curves and MR-T curves of La(0.67+1.33x)Sr(0.33-1.33x)Mn(1-x)Mg(x)O3 (0.00 < or = x < or = 0.25) were studied. The experiment pointed out that all samples exhibit a paramagnetic-ferromagnetic (PM-FM) transition associated with metallic-insulating (MI) transition in the low doping region, which does not occur in the heavy doping zone. The authors suggest that this behavior is attributed to the difference between the Jahn-Teller distortion of the Mn3+ ion neighboring Mg2+ and that of the Mn3+ ion non-neighboring Mg2+, which is confirmed by the IR and Raman spectra. The anomalous transport behavior is dominated by the differerent Jahn-Teller distortion. |
| Keywords: | Coherence physics Magnetic properties Double-exchange Transport properties Rare earths |
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