Abstract

Pulsed radiospectroscopy method has been used to study nuclear quadruple resonance (NQR) spectra of <sup>69</sup>Ga and <sup>115</sup>In isotopes in the layered semiconductors GaSe and InSe. It has been found that in GaSe and InSe there is a considerable temperature dependence of NQR frequency which in the temperature range of 250 to 390 K is practically linear with conversion slope 1.54 kHz/degree for <sup>69</sup>Ga and 2.35 kHz/degree for <sup>115</sup>In. In the same crystals the effect of uniaxial pressure on NQR spectra applied along the optical axis с up to the values of 500 kg/сm<sup>2</sup> has been studied. A strong attenuation of NQR spectra intensity with increase in pressure on layered crystal package has been established. The unvaried multiplicity of resonance spectra indicates the absence of structural transformations in these layered crystals over the investigated range of temperatures and pressures.

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