EVIDENCE FOR A CROSSOVER FROM MULTIPLE TRAPPING TO PERCOLATION IN THE HIGH-TEMPERATURE ELECTRICAL-CONDUCTIVITY OF MN-DOPED LACRO3

被引：36

作者：

RAFFAELLE, R ^{[1
]}

ANDERSON, HU ^{[1
]}

SPARLIN, DM ^{[1
]}

PARRIS, PE ^{[1
]}

机构：

[1] UNIV MISSOURI,DEPT CERAM ENGN,ROLLA,MO 65401

来源：

PHYSICAL REVIEW LETTERS | 1990年 / 65卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.65.1383

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We explain the deep electrical conductivity minimum near x=0.05 in the perovskite-type ceramic LaCr1-xMnxO3 as a crossover between two different regimes of hopping conduction. At low Mn concentrations the diffusion of small polarons among Cr ions is limited by multiple trapping at energetically lower Mn sites. At higher concentrations a percolating path of Mn sites forms and direct transport between Mn ions dominates the conduction process. © 1990 The American Physical Society.

引用

页码：1383 / 1386

页数：4

共 17 条

[1] EXCITATION DYNAMICS IN RANDOM ONE-DIMENSIONAL SYSTEMS [J].