Semiconductor Physics, Quantum Electronics & Optoelectronics. 2011. V. 14, N 2. P. 164-166.
DOI: https://doi.org/10.15407/spqeo14.02.164

The electric field gradient asymmetry parameter in InSe
Z.D. Kovalyuk1, A.G. Khandozhko2, G.I. Lastivka2, A.P. Samila2

1Chernivtsi Department of the Institute of Materials Science Problems, NAS of Ukraine, 5, Iryna Vilde str., 58001 Chernivtsi, Ukraine
2 Yu. Fed’kovych Chernivtsi National University, 2, Kotsyubyns’ky str., 58012 Chernivtsi, Ukraine

Abstract. The complex NQR spectra of 115 In caused by presence of structural defects called polytypes are observed in a monocrystalline InSe sample. Multiple ratio of average frequencies of NQR spectra that correspond to four resonance transitions of quadrupole nuclii with spins I = 9/2 testifies to existence of axial symmetry of the electric field gradient in In nucleus positions inside the InSe crystal structure. The latter is confirmed by the dependence of the NQR spectrum amplitude on the angle between the main crystal axis c and vector of high-frequency field H 1 . However, presence of a residual intensity in the spectra at c || Н 1 can indicate the existence of crystal blocks in bulk of the sample with weak angular misorientation.

Keywords: NQR, multiplet spectra, structural defects, polytypes.

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