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Study of the EFG tensor at 75As nuclei in Ge-As-Se chalcogenide glasses

Authors


Correspondence to: Olga Bolebrukh, Laboratory of Magnetic Resonance, Institute of Physics and Technology, Immanuel Kant Baltic Federal University, A. Nevski 14, 236041 Kaliningrad, Russia. E-mail: olga_rf@mail.ru

Abstract

Asymmetry parameters of the electric field gradient tensor at 75As nuclei were determined for chalcogenide glassy semiconductors (CGS) of the Ge-As-Se system by comparing the experimental and simulated 75As nuclear quadrupole resonance nutation interferograms. The electric field gradient asymmetry in CGS was analyzed, and it is believed that a structural change in these glassy semiconductors takes place at math formula =  2.425. Electron paramagnetic resonance spectra of the Ge-As-Se system were obtained for the first time. A comparison was made between the results of analysis of the Ge-As-Se system by nuclear quadrupole resonance and electron paramagnetic resonance methods, and this allowed us to make the supposition that a structural phase transition occurs at math formula = 2.4 from two-dimensional to three-dimensional CGS structure. Copyright © 2013 John Wiley & Sons, Ltd.

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