• glassy semiconductors;
  • nuclear quadrupole resonance spectroscopy;
  • geometric phase (Berry phase);
  • asymmetry parameter;
  • electron paramagnetic resonance spectroscopy (EPR)

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 inline image =  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 inline image = 2.4 from two-dimensional to three-dimensional CGS structure. Copyright © 2013 John Wiley & Sons, Ltd.