Electronic paramagnetic resonance of Gd3+ ions in a Pb1-x-yGdxCuyS narrow-gap semiconductor: effects of resonance transitions on conductivity

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Abstract

In a crystals of the narrow-band semiconductor Pb1-x-yGdxCuyS (x = 1.1·10–3, y = 2.5·10–3) at temperatures T = 5—300 K, unusual dependences of the shape of the lines of the EPR spectra of paramagnetic centers Gd3+ on the temperature and microwave power level in the resonator of EPR-spectrometer were discovered by the electron paramagnetic resonance method. Based on the results of the analysis of the shape parameters of the resonance lines recorded in the X-range, it was concluded that one of the reasons for the unusual changes in the observed EPR spectra of Gd3+ centers is the uneven distribution of the acceptor impurity of copper with the formation of regions with different concentrations of free charge carriers. Apparently, in these regions, resonant transitions between the spin states of Gd3+ centers have different effects on the values of the kinetic characteristics of free charge carriers, which lead to different contributions to the quasi-resonant absorption of microwave power.

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About the authors

V. А. Ulanov

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”; Kazan State Power Engineering University;

Email: rrza7@yandex.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan; Kazan

R. R. Zaynullin

Kazan State Power Engineering University

Author for correspondence.
Email: rrza7@yandex.ru
Russian Federation, Kazan

I. V. Yatsyk

Federal Research Center “Kazan Scientific Center of the Russian Academy of Sciences”

Email: rrza7@yandex.ru

Zavoisky Physical-Technical Institute

Russian Federation, Kazan

A. V. Shestakov

Prokhorov General Physics Institute of the Russian Academy of Sciences

Email: rrza7@yandex.ru
Russian Federation, Moscow

A. М. Sinitsin

Kazan State Power Engineering University

Email: rrza7@yandex.ru
Russian Federation, Kazan

References

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2. Fig. 1. EPR spectra of a single-crystal sample of Pb1-x-yGdxCuyS, recorded in the orientations <001>ǁ→H0 and <111>ǁ→H0 (fmw = 9419±1 MHz, T = 5 K, Pmw = 2 mW).

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3. Fig. 2. EPR spectra of a single-crystal sample of Pb1-x-yGdxCuyS, recorded in the orientation <001>ǁ→H0 (fmw = 9419±1 MHz, spectra of group (a) were obtained at Pmw = 5 mW, spectra of group (b) – at T = 14 K).

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4. Fig. 3. Angular dependences of the resonance values ​​of the external magnetic field in the studied Pb1-x-yGdxCuyS sample, calculated with the spin Hamiltonian (1): T = 5 K, fmw = 9419 MHz, Pmw = 0.05 mW.

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5. Fig. 4. The result of the simulation of the EPR spectrum of the Pb1-x-yGdxCuyS sample (T = 15 K, f = 9418.7 MHz, H0 ǁ <001>).

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