Pre-edges in oxygen (1s) x-ray absorption spectra: A spectral indicator for electron hole depletion and transport blocking in iron perovskites

被引：39

作者：

Braun, Artur ^{[1
]}

Bayraktar, Defne ^{[1
]}

Erat, Selma ^{[1
,2
]}

Harvey, Ashley S. ^{[2
]}

Beckel, Daniel ^{[2
]}

Purton, John A. ^{[3
]}

Holtappels, Peter ^{[1
]}

Gauckler, Ludwig J. ^{[2
]}

Graule, Thomas ^{[1
]}

机构：

[1] EMPA Swiss Fed Labs Mat Testing & Res, Lab High Performance Ceram, CH-8600 Dubendorf, Switzerland

[2] ETH, Swiss Fed Inst Technol, Dept Nonmetall Inorg Mat, CH-8053 Zurich, Switzerland

[3] SERC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England

来源：

APPLIED PHYSICS LETTERS | 2009年 / 94卷 / 20期

基金：

英国科学技术设施理事会; 瑞士国家科学基金会;

关键词：

electron-hole recombination; exchange interactions (electron); ferromagnetic materials; lanthanum compounds; metal-insulator transition; X-ray absorption spectra; CONDUCTIVITY; LA1-XSRXMNO3;

D O I：

10.1063/1.3122926

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The e(g)up arrow/(t(2g)down arrow+e(g)down arrow) band ratio in cation-substituted La-Fe oxides is identified in O (1s) x-ray absorption spectra as a linear spectral indicator for conducting electron holes. The t(2g)down arrow and e(g)down arrow bands act as a conductivity inhibitor by ferromagnetic double exchange coupling on the e(g)up arrow electron. Disorder induced by substitution appears to modulate the hole conduction such that an exponential relation is found between the conductivity and the e(g)up arrow/(t(2g)down arrow+e(g)down arrow) ratio and hole concentration. The quantitative correlation of conductivity and x-ray absorption spectra from heterovalent-substituted LaFeO3 lets substitution-driven metal insulator transitions appear in a new light.

引用

页数：3

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