Neutron diffraction studies of structural and magnetic properties of niobium doped cobaltites

被引：19

作者：

Sikolenko, V. ^{[1
,2
]}

Efimov, V. ^{[3
]}

Efimova, E. ^{[3
]}

Sazonov, A. ^{[4
,5
]}

Ritter, C. ^{[6
]}

Kuzmin, A. ^{[7
]}

Troyanchuk, I. ^{[8
]}

机构：

[1] Swiss Fed Inst Technol, Neutron Scattering Lab, CH-5232 Villigen, Switzerland

[2] Paul Scherrer Inst, CH-5232 Villigen, Switzerland

[3] Joint Inst Nucl Res, RU-141980 Dubna, Russia

[4] Rhein Westfal TH Aachen, Inst Crystallog, D-52056 Aachen, Germany

[5] Tech Univ Munich, Res Reactor FRM 2, D-85747 Garching, Germany

[6] Inst Laue Langevin, F-39042 Grenoble, France

[7] Latvian State Univ, Inst Solid State Phys, LV-1063 Riga, Latvia

[8] NAS Belarus, Sci Pract Mat Res Ctr, BY-220072 Minsk, BELARUS

来源：

JOURNAL OF PHYSICS-CONDENSED MATTER | 2009年 / 21卷 / 43期

基金：

俄罗斯基础研究基金会;

关键词：

SPIN-STATE; TRANSITION; LA1-XSRXCOO3; ORDER;

D O I：

10.1088/0953-8984/21/43/436002

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

Neutron powder diffraction studies of the structural and magnetic properties of the La1-xSrxNbyCo1-yO3 solid solutions (x = 0.2, 0.5; y = 0, 0.075, 0.1) have been performed. Substitution of Co2+ by Nb5+ prevents the formation of Co4+ and leads to stabilization of the Co3+ ions in the high-or intermediate-spin state. This is accompanied by the significant change of the Co-O bond length as well as Co-O-Co bond angle in the CoO6 octahedron. The obtained data are in agreement with the negative sign of the magnetic exchange interactions Co3+-O-Co3+ in a relatively wide range of the Co-O-Co bond angles. Diamagnetic dilution by the niobium ions prevents long-range magnetic ordering and strongly increases magnetoresistance at low temperature.

引用

页数：7

共 35 条

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