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Quasi-Two-Dimensional Ferromagnetism in Cr₂Te₃ and Cr₅Te₈ Crystals

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Bester M., Stefaniuk I., Kuzma M.

Acta Physica Polonica A

2015

vol. 127

issue 2

433-435

The crystal structure of CrTe suggests two-dimensional magnetism in the plane perpendicular to the c axis. It is consistent with the temperature dependence of the g factor and EPR lines width observed. In the present paper we investigate the CrTe alloy which has been prepared by melting of the powdered Cr₂Te₃ in evacuated quartz ampoule at the temperature 1600 K. ESR spectra were recorded using X-band (9.4 GHz) spectrometer provided with gas nitrogen cryostat. The shape of the EPR line depends strongly on the temperature. In the vicinity of the room temperature the lines become very wide and weak or disappear completely. At lower temperatures the shape of the lines approaches the Dyson function. The asymmetry of lines is attributed to the strong exchange interactions as well as to the semimetal electrical conductivity. Above the room temperature the shape of spectra is characteristic for the paramagnetic phase. Results were addressed based on the model of critical spin fluctuations in two-dimensional Heisenberg magnet proposed by Eremin et al.

EPR Spectra of Cr in CdTe Crystals

100%

Stefaniuk I., Bester M., Virt I., Kuzma M.

Acta Physica Polonica A

2005

vol. 108

issue 2

413-418

The EPR studies of CdTe:Cr were performed on X-band (9.6 GHz) spectrometer at room temperature. Single CdTe crystals were doped by chromium Cr in the synthesis process. The spectra observed were resolved into two spectra. The first one consisted of very broad line (Δ B=100 mT) and the second one showed a typical fine structure. The complete angular dependence measurements were obtained. The fine structure of Cr^{2+} or Cr^{3+} ions was assumed and simulated. It follows from the theoretical analysis of the obtained spectra that degree of ionization of the chromium Cr dopant is 3+.

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2 Acta Physica Polonica A

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2 Kuzma M.

2 Stefaniuk I.

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Quasi-Two-Dimensional Ferromagnetism in Cr₂Te₃ and Cr₅Te₈ Crystals

EPR Spectra of Cr in CdTe Crystals