Magnetic spin interactions observed by heat capacity measurements for layered compounds:: NaLnTiO4 (Ln = Sm, Eu, Gd, Tb, Dy, Ho and Er)

被引：4

作者：

Ozawa, T. C. ^{[1
]}

Ikoshi, A. ^{[2
]}

Taniguchi, T. ^{[2
]}

Mizusaki, S. ^{[2
]}

Nagata, Y. ^{[2
]}

Noro, Y. ^{[3
]}

Samata, H. ^{[4
]}

Takayanagi, S. ^{[5
]}

机构：

[1] Natl Inst Mat Sci, Tsukuba, Ibaraki 3050044, Japan

[2] Aoyama Gakuin Univ, Coll Sci & Engn, Kanagawa 1578572, Japan

[3] Kawazoe Frontier Technol Co Ltd, Kanagawa 931113, Japan

[4] Kobe Univ, Fac Maritime Sci, Higashinada Ku, Kobe, Hyogo 6580022, Japan

[5] Hokkaido Univ, Sapporo, Hokkaido 0028502, Japan

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2008年 / 448卷 / 1-2期

关键词：

heat capacity; magnetic entropy; lanthanide oxide magnetism; layered structure;

D O I：

10.1016/j.jallcom.2007.01.019

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Magnetic properties of a series of orthorhombic NaLnTiO(4) (Ln = Sm, Eu, Gd, Tb, Dy, Ho and Er) characterized by heat capacity measurements are reported. Magnetic transitions are observed for all NaLnTiO(4) investigated except for Ln = Eu. The change in magnetic entropy closely agrees with the expected theoretical values except for Ln = Sm and Gd. Peak profiles in temperature dependence of heat capacity indicate that Ln = Sm, Tb, Dy, Ho and Er phases possess Ising square lattices. Furthermore, Ln = Gd also exhibits the similar property regardless of its S state; there seems some degree of anisotropy in its magnetic lattice. Magnetization and heat capacity data indicate that superexchange through oxygen is the dominant spin interaction in this system. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：64 / 68

页数：5

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