Magnetic structure of the manganites heavily doped by Fe and Cr ions

被引：19
作者：
Troyanchuk, I. O.
Bushinsky, M. V.
Szymczak, H.
Baran, M.
Baerner, K.
机构：
[1] Natl Acad Sci, Joint Inst Solid State & Semicond Phys, Minsk 220072, BELARUS
[2] Polish Acad Sci, Inst Phys, PL-02668 Warsaw, Poland
[3] Univ Gottingen, Phys Inst 4, D-37073 Gottingen, Germany
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 312卷 / 02期
关键词：
crystal and magnetic structure; magnetically ordered material; superexchange interaction; magnetic phase diagram;
D O I：
10.1016/j.jmmm.2006.11.214
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Powder neutron diffraction and magnetic studies have been performed for NdMn0.5Fe0.5O3 and NdMn0.5Cr0.5O3 manganites. In NdMn0.5Cr0.5O3, magnetic structure has been revealed consisting of ferromagnetic and G-type antiferromagnetic components as result of a 3d-ions magnetic moments ordering. Magnetic moments of Nd-ions are parallel to the ferromagnetic component. In NdMn0.5Fe0.5O3 only the anti ferromagnetic G-type structure has been found whereas Nd-sublattice was not ordered. In the both compounds, magnetic moments of 3d-ions are significantly less than one can expect, what is interpreted in terms of intrinsic chemical inhomogeneity. Magnetic phase diagrams have been constructed for the Nd(Mn1-xMx)O-3 (M = Fe, Cr) systems, interpreted assuming superexchange interactions Mn3+-O-Cr3+ to be positive, Mn3+-O-Fe3+ negative and taking into account a disordered arrangement of Mn and Cr ions in the crystal structure sublattice as well as interplay between Jahn-Teller effect and superexchange interactions. (c) 2006 Elsevier B.V. All rights reserved.
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页码：470 / 475
页数：6
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