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Magnetic properties of Ga‐substituted FeGa 0.1 Cr 1.9 S 4 with inverse spinel structure
Author(s) -
Son Bae Soon,
Kim Sam Jin,
Kim Chul Sung
Publication year - 2004
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200304552
Subject(s) - spinel , mössbauer spectroscopy , rietveld refinement , magnetization , crystal structure , magnetoresistance , diffraction , crystallography , materials science , spectroscopy , ion , mössbauer effect , chemistry , physics , magnetic field , metallurgy , optics , organic chemistry , quantum mechanics
FeGa 0.1 Cr 1.9 S 4 has been studied with Mössbauer spectroscopy, X‐ray diffraction, magnetization, and magnetoresistance (MR). The crystal structure is found to be a cubic spinel by Rietveld refinement of X‐ray diffraction. The Mössbauer spectrum of FeGa 0.1 Cr 1.9 S 4 consists of two doublets at room temperature. The cation distribution is determined by Mössbauer spectroscopy, which reveals that the small amounts of Ga ions occupy tetrahedral sites and FeGa 0.1 Cr 1.9 S 4 has an inverse spinel type of structure. MR measurement of the sample shows that the metal–semiconductor transition occurs in the temperature range 77–300 K. The gap energies for regions I ( T < 150 K) and II ( T > 200 K) are 24.1 and 103.8 meV, respectively. (© 2004 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)