Pressure dependences of the metal-insulator transition temperature of La0.7Ca0.3Mn1-x(Fe/Ge)(x)O-3 perovskites
文献类型：期刊论文
| 作者 | Medvedeva, IV ; Barner, K ; Rao, GH ; Hamad, N ; Bersenev, YS ; Sun, JR |
| 刊名 | PHYSICA B-CONDENSED MATTER
 |
| 出版日期 | 2000 |
| 卷号 | 292期号:3-4页码:250 |
| 关键词 | MAGNETORESISTANCE LA1-XSRXMNO3 RESISTIVITY SYSTEM |
| ISSN号 | 0921-4526 |
| 通讯作者 | Barner, K (reprint author), Univ Gottingen, Inst Phys 4, Bunsenstr 11-15, D-37073 Gottingen, Germany. |
| 中文摘要 | The temperature dependences of the resistivity of La0.7Ca0.3Mn1-xFexO3 and La0.7Ca0.3Mn1-xGexO3 (x = 0, 0.02, 0.04) mixed crystals were studied under hydrostatic pressures up to 15 kbar. The substitution of Fe for Mn results in an increase of resistivity and a decrease of the metal-insulator transition temperature T-m, while the substitution of Ge for Mn leads to a more complicated behaviour: at first, the metal-insulator transition temperature T-m decreases in the range 0 < x(Ge) < 0.02, increases for x(Ge) > 0.02 and decreases again for x(Ge) > 0.04. The maximum of the rho(T) curves T-m shifts to the higher temperatures with a rate of dT(m)/dP = (1.6-29) R/kbar dependent on the T-m value. From the results obtained, a correlation between T-m and its pressure derivative dT(m)/dP could be established: higher dT(m)/dP values correspond to lower T-m's. This result is in accordance with the general trend of dT(m)/dP versus T-m as derived for other manganites and is discussed in terms of a competition between super exchange and double exchange. (C) 2000 Elsevier Science B.V. All rights reserved. |
| 收录类别 | SCI |
| 语种 | 英语 |
| 公开日期 | 2013-09-24 |
| 源URL | [http://ir.iphy.ac.cn/handle/311004/51392]  |
| 专题 | 物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文 |
| 推荐引用方式 GB/T 7714 | Medvedeva, IV,Barner, K,Rao, GH,et al. Pressure dependences of the metal-insulator transition temperature of La0.7Ca0.3Mn1-x(Fe/Ge)(x)O-3 perovskites[J]. PHYSICA B-CONDENSED MATTER,2000,292(3-4):250. |
| APA | Medvedeva, IV,Barner, K,Rao, GH,Hamad, N,Bersenev, YS,&Sun, JR.(2000).Pressure dependences of the metal-insulator transition temperature of La0.7Ca0.3Mn1-x(Fe/Ge)(x)O-3 perovskites.PHYSICA B-CONDENSED MATTER,292(3-4),250. |
| MLA | Medvedeva, IV,et al."Pressure dependences of the metal-insulator transition temperature of La0.7Ca0.3Mn1-x(Fe/Ge)(x)O-3 perovskites".PHYSICA B-CONDENSED MATTER 292.3-4(2000):250. |
入库方式： OAI收割
来源：物理研究所
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