Magnetic properties and specific heat of LaMn1-xTixO3+δ (0 < x ≤ 0.2)

被引：9
作者：
Sahana, M
Venimadhav, A
Hegde, MS
Nenkov, K
Rössler, UK
Dörr, K
Müller, KH
机构：
[1] IFW Dresden, D-01171 Dresden, Germany
[2] Indian Inst Sci, Solid State & Struct Chem Unit, Bangalore 560012, Karnataka, India
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 260卷 / 03期
关键词：
manganites; re-entrant spin-glass; specific heat;
D O I：
10.1016/S0304-8853(02)01341-0
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We present a magnetic study of the insulating perovskite LaMn1-xTixO3+delta (0<xless than or equal to0.2) including measurements of magnetization, susceptibility, and magnetic relaxation. The Curie temperature was found to decrease with increasing content of Ti. Two distinct magnetic transitions, irreversibility, non-exponential relaxation and aging effects confirm a reentrant spin-glass state for x = 0.2. The time decay of the magnetization has an algebraic functional form for times up to 2 h. The specific heat also displays characteristic features of a spin-glass system by a linear low-temperature dependence and a broadened peak near the temperature of the reentrant transition. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码：361 / 370
页数：10
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