Heterogeneous magnetic and electronic states in Ca1-xLaxMnO3-δ (x ≤ 0.12) single crystals with electron doping

被引：6

作者：

Loshkareva, N. N. ^{[1
]}

Korolyov, A. V. ^{[1
]}

Solin, N. I. ^{[1
]}

Mostovshchikova, E. V. ^{[1
]}

Sukhorukov, Yu. P. ^{[1
]}

Naumov, S. V. ^{[1
]}

Balbashov, A. M. ^{[2
]}

机构：

[1] Russian Acad Sci, Inst Met Phys, Ural Div, Ekaterinburg 620041, Russia

[2] Moscow Power Inst, Moscow 105835, Russia

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2006年 / 300卷 / 01期

关键词：

Manganites; Electron doping; Ca1-xLaxMnO3-delta; Magnetic phase transition; Magnetoresistance; Optical absorption;

D O I：

10.1016/j.jmmm.2005.10.168

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The magnetic, transport, and optical properties of electron-doped Ca1-xLaxMnO3-delta single crystals with x <= 0.12 were studied. The magnetic measurements show that in single crystals with x = 0 and 0.05 the G-type AFM phase with weak FM component is realized and in crystals with x = 0.10 and 0.12 the G-and C-type AFM phases coexist. The C-type magnetic structure arises at less concentration of La than in polycrystalline samples as a result of oxygen vacancies being additional source of electrons. Under magnetic transitions in the G-and C-type phases, resistivity and magnetoresistance of the doped single crystals have anomalies. Optical absorption in IR range indicates formation of a charge gap in crystals with x = 0.10 and 0.12 at appearance of the C-AFM and monoclinic phase with orbital/charge ordering. By comparing optical and transport properties, heterogeneous electronic state and its relation with heterogeneous magnetic state are shown. (C) 2005 Elsevier B.V. All rights reserved.

引用

页码：E140 / E143

页数：4

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