Negligible magnetism in excellent structural quality CrxTi1-xO2 anatase:: Contrast with high-TC ferromagnetism in structurally defective CrxTi1-xO2 -: art. no. 217203

被引：156

作者：

Kaspar, TC ^{[1
]}

Heald, SM

Wang, CM

Bryan, JD

Droubay, T

Shutthanandan, V

Thevuthasan, S

McCready, DE

Kellock, AJ

Gamelin, DR

Chambers, SA

机构：

[1] Pacific NW Natl Lab, Richland, WA 99352 USA

[2] Univ Washington, Dept Chem, Seattle, WA 98195 USA

[3] IBM Corp, Almaden Res Ctr, San Jose, CA 95120 USA

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 95卷 / 21期

关键词：

D O I：

10.1103/PhysRevLett.95.217203

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We reexamine the mechanism of ferromagnetism in doped TiO2 anatase, using epitaxial CrTiO2 with excellent structural quality as a model system. In contrast to highly oriented but defective CrTiO2 (similar to 0.5 mu(B)/Cr), these structurally superior single crystal films exhibit negligible ferromagnetism. Similar results were obtained for CoTiO2. We show for the first time that charge-compensating oxygen vacancies alone, as predicted by F-center mediated exchange, are not sufficient to activate ferromagnetism. Instead, the onset of ferromagnetism correlates with the presence of structural defects.

引用

页数：4

共 19 条

[1] Activation of high-Tc ferromagnetism in Co2+:TiO2 and Cr3+:TiO2 nanorods and nanocrystals by grain boundary defects [J].