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- W1036770902 abstract "The purpose of the present work was to study the infrared optical properties of Hg1-xFexSe mixed crystal in order to determine the composition dependence of the energy gap in this material. It is believed that the absolute value of the negative energy gap for Hg1-xFexSe decreases with increasing Fe content and at low temperatures is equal to zero for the mixed crystal composition corresponding to about 15% of Fe. This value was given in some recent papers analysing the results of the optical measurements performed at temperatures above 100 K [1] and the helium temperature quantum oscillations observed for the magnetoplasma waves [2]. In this paper we analysed the infrared reflectivity spectra taken with the use of the Buker FTIR 113v spectrometer. The measurements were performed on different Hg1-xFexSe mixed crystals in a wide temperature range (4.5 K ≤ T ≤ 295 K). The crystals were obtained by the Bridgman method in the Institute of Physics, Polish Academy of Sciences in Warsaw, the sample composition (0 ≤ x ≤ 0.1) was determined by the energy dispersive X-ray fluorescence analysis. The Hall measurements at various temperatures have also been performed for the most of crystals . The Fe level energy at 4.2 K increases with the Fe concentration. This effect in the high-doping range (x < 0.01) suggested in [2] is two times stronger than that given in [3]. Morever, according to [2] the important nonlinear effect in such" @default.
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- W1036770902 date "1992-11-01" @default.
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- W1036770902 title "Composition Dependence of the Energy Gap in HgFeSe - Optical Verification" @default.
- W1036770902 doi "https://doi.org/10.12693/aphyspola.82.757" @default.
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