Chemical size effect on the magnetic and electrical properties in the (Tb1-xEux)MnO3 (0≤x≤1.0) System

被引：25

作者：

Chan, T. S.

Liu, R. S. ^{[1
]}

Yang, C. C.

Li, W. -H.

Lien, Y. H.

Huang, C. Y.

Lee, J. -F.

机构：

[1] Natl Taiwan Univ, Dept Chem, Taipei 106, Taiwan

[2] Natl Taiwan Univ, Ctr Nano Storage Res, Taipei 106, Taiwan

[3] Acad Sinica, Inst Phys, Taipei 115, Taiwan

[4] Natl Cent Univ, Dept Phys, Chungli 320, Taiwan

[5] Chinese Culture Univ, Inst Mat Mfg, Taipei 111, Taiwan

[6] Natl Taiwan Normal Univ, Inst Optoelect Sci & Technol, Taipei 106, Taiwan

[7] Natl Synchrotron Radiat Res Ctr, Hsinchu 300, Taiwan

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2007年 / 111卷 / 09期

关键词：

D O I：

10.1021/jp067680y

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：

The effect of isovalent chemical substitution of Eu3+ into the Tb3+ sites on the magnetic and electrical properties of (Tb1-xEux)MnO3 (0 <= x <= 1.0) system has been investigated. The orthorhombic structure with space group Pbnm is observed in this series of materials. An increase in Mn-O bond distance with increasing Eu content leads to improvement in the overlap between the Mn 3d and O 2p orbital thereby causing a decrease in activation energy and resistivity. Moreover, as the Eu content increases, the effective moments (mu(eff)) are reduced linearly and an exchange coupling is observed in Tb-Tb, Tb-Eu, and Eu-Eu complexes for x = 0.1 and 0.3 samples. Both these features can be related to the substitution of bigger Eu3+ ions replacing the original Tb-Tb coupling.

引用

页码：2262 / 2267

页数：6

共 34 条

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