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

T. S. Chan, R. S. Liu, C. C. Yang, W. H. Li, Y. H. Lien, C. Y. Huang, J. F. Lee

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Abstract

The effect of isovalent chemical substitution of Eu3+ into the Tb3+ sites on the magnetic and electrical properties of (Tb 1-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 (μeff) 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.

Original languageEnglish
Pages (from-to)2262-2267
Number of pages6
JournalJournal of Physical Chemistry B
Volume111
Issue number9
DOIs
StatePublished - 8 Mar 2007

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