Substitution effect on metal–insulator transition in Cu(Ir1−xMx)2S4 (M=Sn, Hf)

Koseki, Naoto; Ebisu, Shuji; Nagata, Satoshi

doi:10.1016/j.jallcom.2010.09.004

Cited by 4 publications

(1 citation statement)

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“…Compounds with CuM 2 X 4 (X=S, Se) spinel structure have attracted great attention due to their numerous interesting structural, magnetic, and electrical properties [1][2][3][4][5][6]. Spinels such as CuIr 2 S 4 exhibit a temperature-induced metal-insulator (M-I) transition at approximately T M-I =230 K with structural transformation, showing hysteresis upon heating and cooling [1] , [5] , [7] , [8]. On the other hand, CuIr 2 Se 4 remains metallic down to 0.5 K [9], without an M-I transition such as in CuIr 2 S 4 .…”

Section: Introductionmentioning

confidence: 99%

RAMAN CHARACTERIZATION OF CuIrSnX4 NORMAL-SPINEL SYSTEMS

Barahona¹,

Galdámez²,

Valencia-Gálvez³

et al. 2020

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CuIrSnS4, CuIrSnSe4 and CuIrSnS2Se2 were synthetized by a solid-state reaction at 700 °C. Powder X-ray diffraction patterns were consistent with normal spinel-type structure. Scanning electron microscopy (SEM-EDS) images showed a uniform distribution of CuIr-Sn-S and Se atoms in the samples. Raman scattering analysis revealed A1g, Eg, and three F2g vibrational modes in spectra (cubic Fd3m space-group). Signal at ~320 cm-1 corresponded to the A1g mode, while the band at  230 cm-1 was assigned to the F2g(2) mode due to the asymmetric stretching of the Cu-X bond. Raman spectra were compared with those of the previously published thio- and selenospinels.

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