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Title: Alternating current conductivity and electron spin resonance of the Cd{sub 1-x}Fe{sub x}Te alloys

Abstract

The results of measurements of frequency dependences of conductivity and electron spin resonance (ESR) of the Cd{sub 1x}Fe{sub x}Te alloys (0.01 {<=} x {<=} 0.05) at room temperature are presented. It is found that, in the composition range 0.003 {<=} x {<=} 0.05, a new asymmetric ESR absorption line with g {approx} 3.9 emerges, and its hysteresis manifests itself while the samples are magnetized. The line with g {approx} 3.9 is attributed to the charge state 3{sup +} of the Fe atoms, which occurs in tetrahedra with three Fe atoms.

Authors:
; ; ;  [1]; ; ;  [2]
  1. Technical University of Lublin (Poland)
  2. Belarussian State University (Belarus)
Publication Date:
OSTI Identifier:
21088066
Resource Type:
Journal Article
Resource Relation:
Journal Name: Semiconductors; Journal Volume: 41; Journal Issue: 5; Other Information: DOI: 10.1134/S1063782607050089; Copyright (c) 2007 Nauka/Interperiodica; Article Copyright (c) 2007 Pleiades Publishing, Ltd; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION; ALTERNATING CURRENT; CADMIUM ALLOYS; CHARGE STATES; ELECTRON SPIN RESONANCE; FREQUENCY DEPENDENCE; HYSTERESIS; IRON ALLOYS; TELLURIUM ALLOYS; TEMPERATURE RANGE 0273-0400 K

Citation Formats

Zhukovski, P., Partyka, Ya., Vengerek, P., Koltunovich, T., Sidorenko, Yu., Stelmakh, V., and Lapchuk, N. Alternating current conductivity and electron spin resonance of the Cd{sub 1-x}Fe{sub x}Te alloys. United States: N. p., 2007. Web. doi:10.1134/S1063782607050089.
Zhukovski, P., Partyka, Ya., Vengerek, P., Koltunovich, T., Sidorenko, Yu., Stelmakh, V., & Lapchuk, N. Alternating current conductivity and electron spin resonance of the Cd{sub 1-x}Fe{sub x}Te alloys. United States. doi:10.1134/S1063782607050089.
Zhukovski, P., Partyka, Ya., Vengerek, P., Koltunovich, T., Sidorenko, Yu., Stelmakh, V., and Lapchuk, N. Tue . "Alternating current conductivity and electron spin resonance of the Cd{sub 1-x}Fe{sub x}Te alloys". United States. doi:10.1134/S1063782607050089.
@article{osti_21088066,
title = {Alternating current conductivity and electron spin resonance of the Cd{sub 1-x}Fe{sub x}Te alloys},
author = {Zhukovski, P. and Partyka, Ya. and Vengerek, P. and Koltunovich, T. and Sidorenko, Yu. and Stelmakh, V. and Lapchuk, N.},
abstractNote = {The results of measurements of frequency dependences of conductivity and electron spin resonance (ESR) of the Cd{sub 1x}Fe{sub x}Te alloys (0.01 {<=} x {<=} 0.05) at room temperature are presented. It is found that, in the composition range 0.003 {<=} x {<=} 0.05, a new asymmetric ESR absorption line with g {approx} 3.9 emerges, and its hysteresis manifests itself while the samples are magnetized. The line with g {approx} 3.9 is attributed to the charge state 3{sup +} of the Fe atoms, which occurs in tetrahedra with three Fe atoms.},
doi = {10.1134/S1063782607050089},
journal = {Semiconductors},
number = 5,
volume = 41,
place = {United States},
year = {Tue May 15 00:00:00 EDT 2007},
month = {Tue May 15 00:00:00 EDT 2007}
}
  • Electron spin resonance (ESR) studies were made on the Mn/sup 2 +/ constituent of Cd/sub x/Zn/sub y/Mn/sub z/Te (x+y+z = 1) polycrystalline semimagnetic semiconductors, covering the whole range of solid solutions available, alloys with 0.10< or =z< or =0.75 being used. These materials exhibit spin-glass properties at low temperatures. The temperature dependence of the Mn/sup 2 +/ ESR linewidths were measured in the samples between 4.2 to 300 K, and it was found in each case that the linewidth increased with decreasing temperature, reaching a maximum value at a critical temperature T/sub c/. The temperature variation of the linewidths weremore » found to fit a theoretical expression of the form ..delta..H = A(T/sub c//(T-T/sub c/))/sup ..cap alpha../, where ..delta..H is the linewidth, A is a constant, T/sub c/ is the critical temperature and ..cap alpha.. is the critical exponent. The percolation limit for any ratio of x:y was found to be in the range 0.20< or =z< or =0.25. For values of z above this limit, T/sub c/ was found to vary smoothly with z for fixed x:y ratios, showing a linear variation in the limiting case of Zn/sub 1-z/Mn/sub z/Te , and all the lines extrapolated to a value of T/sub c/ = 305 K for MnTe. For fixed values of z the values of T/sub c/ were found to increase linearly with y. The value of ..cap alpha.. was found in each case to fall within the range 0.33 +- 0.08. In some samples an extra line of width a100 G was found superimposed on the main ESR line, and it is attributed to clustering of Mn/sup 2 +/ ions in the structures, with the resultant line from the cluster being exchange narrowed.« less
  • Conduction-electron spin resonance in Hg/sub 1-x/Cd/sub x/Te has been examined at 4.2/sup 0/K and 76x10/sup 9/ Hz for a sample with an electron concentration of about 10/sup 1/5 cm/sup -/3. The free-electron g factors derived from the spin resonance are in satisfactory agreement with values calculated from Kane's model.
  • Single-crystal ingots of ZnSe/sub 1-x/Te/sub x/ (0< or =x< or =0.03), Zn/sub 1-x/ Cd/sub x/Se (0< or =x< or =0.15), and Zn/sub x/Cd/sub 1-x/S (0< or =x< or =0.35) with diameters up to 50 mm and height up to 20 mm were prepared from the vapor phase. Investigations were made of the cathodoluminescence emitted by these crystals and of the characteristics of the lasers made from them and subjected to longitudinal pumping with an electron beam. In contrast to the two other systems, single crystals of ZnSe/sub 1-x/ Te/sub x/ were unsuitable for semiconductor lasers emitting in the dark bluemore » range because deep levels appeared in the band gap at low Te concentrations.« less
  • We report the first observation of stimulated emission from Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te--CdTe and Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te--Cd/sub 1-//sub y-italic/Mn/sub y-italic/Te multiple quantum well structures. The active superlattice (SL) regions of these new laser structures consist of either 25 CdTe or 25 Cd/sub 1-//sub y-italic/Mn/sub y-italic/Te quantum wells alternating with 24 Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te barriers. The emission from the Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te--CdTe lasers occurs at 763--766 nm when optically pumped at T-italic = 25 K. The Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te--Cd/sub 1-//sub y-italic/Mn/sub y-italic/Te lasers emit coherent, visible red radiation (665--670 nm) when optically pumped at T-italic = 15more » K at a peak power density of 2.00 x 10/sup 4/ W/cm/sup 2/. Stimulated emission from double-layer Cd/sub 1-//sub x-italic/Mn/sub x-italic/Te--CdTe heterostructures has also been observed.« less
  • Magic-angle sample-spinning NMR spectra of /sup 111/Cd and /sup 125/Te in Cd/sub 1-//sub x/Zn/sub x/Te semiconductor alloys have been recorded for 0less than or equal toxless than or equal to1. The /sup 111/Cd NMR spectra exhibit a single line whose chemical shift and linewidth depend on x. The linear dependence of the /sup 111/Cd chemical shift on x is assumed to be the result of charge transfer, while the linewidth dependence is shown to be the result of a random distribution of Zn atoms which are next-nearest neighbors to Cd. The /sup 125/Te spectra exhibit multiple lines, their number andmore » chemical shift depending on x. The different chemical shifts of the Te lines are assigned to the five different cation configurations: Cd/sub n/Zn/sub 4-//sub n/, n = 0,...,4: around the Te. The intensities of the experimental Te lines are compared to those in spectral simulations obtained by assuming a random distribution of the cations. The comparison reveals small deviations from a random distribution of the cations. This clustering phenomenon and the effect of the bond-length changes with x on the /sup 125/Te chemical shift are discussed.« less