Magnetic and kinetic properties of crystals Hg1–x–yCdxDyySe

T. T. Kovalyuk; E. V. Maistruk; P. D. Maryanchuk

doi:10.15222/TKEA2014.1.47

T. T. Kovalyuk Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine
E. V. Maistruk Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine
P. D. Maryanchuk Yurii Fedkovych Chernivtsi National University, Chernivtsy, Ukraine

DOI: https://doi.org/10.15222/TKEA2014.1.47

Keywords: crystal, magnetic susceptibility, cluster, electric conductivity

Abstract

This paper presents research results on the magnetic and kinetic properties of Hg_1–x–yCd_xDy_ySe crystals. The coefficient of thermoelectric figure of merit of Hg_1–x–yCd_xDy_ySe crystals is determined on the basis of the temperature dependence of electrical conductivity and thermoelectric power. The temperature dependence of the magnetic susceptibility has the form typical for paramagnets and decreases with the temperature increase. The growth of the magnetic susceptibility with the decrease of the temperature results from the decrease in the disorienting effect of thermal vibrations of the atoms in crystal lattice on orientation of the magnetic moments of Dy in magnetic field. The authors have established that the characteristics of the magnetic susceptibility result from the presence of clusters with different sizes. The characteristic properties of the changes in kinetic coefficients with temperature variation for Hg_1–x–yCd_xDy_ySe samples suggests that vacancies in the Se sublattice and interstitial mercury mainly affect the transport phenomena in these crystals. It is known that mercury chalcogenides and solid solutions based on mercury interstitials and vacancies in the chalcogen sublattice are donors. The temperature dependence of the electrical conductivity for Hg_1–x–yCd_xDy_ySe are metallic in character, that is s decreases with increasing temperature due to decreasing mobility of electrons, the Hall coefficient of the crystals Hg_1–x–yCd_xDy_ySe does not depend on temperature, which is associated with the degeneracy of the electron gas. Thermoelectric power for Hg_1–x–yCd_xDy_ySe samples is negative and its absolute value increases with the temperature increase due to reduction in the degree of degeneracy of the electron gas. Research results indicate prospects of the application of Hg_1–x–yCd_xDy_ySe crystals in spintronics devices.

References

Lerinman N.K., Mar'yanchuk P.D., Ponomarev A.I. et al. Hole boil-off and the magnetoresitance of the semimagnetic semiconductor Hg1–xMnxTe1–ySey. Semiconductors, 1997, vol. 31, no 10, pp. 1030-1036. https://doi.org/10.1134/1.1187019

Kovalyuk T.T., Maistruk E.V., Maryanchuk P.D. Magnetic, optical, and kinetic properties of Hg1–x–yMnxDyyTe crystals. Inorganic Materials, 2013, vol. 49, no 5, pp. 445-449. https://doi.org/10.1134/S0020168513050051

Romcevic M., Kulbachinskii V.A., Romcevic N., Maryanchuk P.D., Churrilov. L.A. Optical properties of Hg1–xMnxTe1–ySey. Infrared Physics and Technology, 2005, vol. 46, iss. 5, pp. 379-387. https://doi.org/10.1016/j.infrared.2004.06.007

Kul’bachinskii V. A., Churilov I. A., Mar’yanchuk P. D., Lunin R. A. Galvanomagnetic properties of Hg1–xMnxTe1–ySey semimagnetic semiconductors. Journal of Experimental and Theoretical Physics, 1997, vol. 85, iss. 5, pp. 989-993. https://doi.org/10.1134/1.558405

Kulbachinskii V. A., Churilov I. A., Maryanchuk P. D., Lunin R. A. Effect of selenium on the galvanomagnetic properties of the diluted magnetic semiconductor Hg1–xMnxTe1–ySey. Semiconductors, 1998, vol. 32, no 1, pp. 49-51. https://doi.org/10.1134/1.1187367

Milivojevic D., Babic Stojic B., Stojic M., Kulbachinskii V.A., Maryanchuk P.D., Churilov I.A. Electron paramagnetic resonance studies of Hg1–xMnxTe1–ySey, Solid State Communications, 2002, vol. 122, iss. 7–8, pp. 389-393. https://doi.org/10.1016/S0038-1098(02)00132-1

Maryanchuk P.D., Maistruk E. V. Giant magnetoresistance in Hg1–x–yMnxFeyTe crystals. Russian Physics Journal, 2007, vol. 50, no 10, pp. 985-992. https://doi.org/10.1007/s11182-007-0143-z

Kovalyuk T. T., Maryanchuk P. D., Maistruk E. V., and Koziarskyi D. P. Optical properties of Hg1–x–yCdxDyySe crystals. Russian Physics Journal, 2013, vol. 56, iss. 7, pp. 831-836. https://doi.org/10.1007/s11182-013-0106-5

Tverdye rastvory v poluprovodnikovykh sistemakh [Solid solutions in semiconductor systems. Reference book] Moskow, Nauka, 1978, 188 p. (Rus)

Maryanchuk P.D., Maistruk E.V. Effect of heat treatment in sulfur and mercury vapors on the magnetic susceptibility of Hg1–xMnxTe1–ySy. Inorganic Materials, 2008, vol. 44, iss. 5, pp. 475-480. https://doi.org/10.1134/S0020168508050087

Mogilevskii B.M., Chudnovskii A.F. Teploprovodnost' poluprovodnikov [The thermal conductivity of semiconductors] Moskow, Nauka 1972, 535 p.