Abstract
Samples of FeGaxCr2–xS4 (x = 0.1, 0.3) have been studied with Mossbauer spectroscopy, X-ray diffraction, magnetization, and magnetoresistance (MR). The Mossbauer spectra of the samples consist of the two doublets at room temperature. Fe ions migrate from the tetrahedral (A) site to the octahedral (B) site with increase of Ga substitutions. The electric quadrupole splitting of the A sites in Mossbauer spectra for the samples x = 0.1 and x = 0.3, at 295 K, are 0.30 and 0.83 mm/s, respectively. It gives a direct evidence that Ga ion stimulate asymmetric charge distribution of Fe ions in the A site. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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