Direct evidence for double-exchange coupling in Ru-substituted La0.7Pb0.3Mn1-xRuxO3, 0.0 ≤ x ≤ 0.4

被引：24

作者：

Manoharan, SS ^{[1
]}

Sahu, RK

Rao, ML

Elefant, D

Schneider, CM

机构：

[1] Indian Inst Technol, Dept Chem, Mat Chem Lab, Kanpur 208016, Uttar Pradesh, India

[2] Inst Solid State Res, D-01069 Dresden, Germany

来源：

EUROPHYSICS LETTERS | 2002年 / 59卷 / 03期

关键词：

D O I：

10.1209/epl/i2002-00216-4

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The La0.7Pb0.3Mn1-xRuxO3 (0.0less than or equal to x less than or equal to 0.4) system shows an innate relationship between Mn and Ru ions by a unique double-exchange mediated transport behavior. This is exonerated by the coexistence of T-p and T-c (range 330 K-245 K for 0.0 less than or equal to x less than or equal to 0.4). For Ru > 30%, the hole carrier mass influences the transport property. X-ray absorption spectra suggest that the T-c-T-p match is due to the transport mediated by the Mn3+/ Mn4+ <-->Ru4+/Ru5+ redox pair and also due to the broad low-spin Ru:4d conduction band. For x> 0.2, T< 0.5 T-c obeys a modified variable-range hopping model, where kT(0) proportional to( M/M-s)(2), suggesting a random magnetic potential which localizes the charge carriers.

引用

页码：451 / 457

页数：7

共 41 条

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