Effect of Hydrostatic Pressure on the Electronic Structure of the Crystal NiMnAs

Authors S.V. Syrotyuk , I.Ye. Lopatynskyi , V.M. Shved , N.O. Shcherban

National University "Lviv Polytechnic", 12, S. Bandera Str., 79013 Lviv, Ukraine

Issue Volume 9, Year 2017, Number 5
Dates Received 15 June 2017; revised manuscript received 07 August 2017; published online 16 October 2017
Citation S.V. Syrotyuk, I.Ye. Lopatynskyi, V.M. Shved, N.O. Shcherban, J. Nano- Electron. Phys. 9 No 5, 05039 (2017)
DOI 10.21272/jnep.9(5).05039
PACS Number(s) 71.15.Ap, 71.20.Be, 71.27.+a
Keywords Energy spectrum of electrons, Spin polarization, Strong correlation of electrons, Magnetic moment, Influence of hydrostatic pressure.
Annotation The electronic energy spectra and densities of the electronic states of semimetallic NiMnAs crystals are calculated without taking into account the pressure and strong electron correlations and with the inclusion of the latter in the calculation scheme. The large influence of strong correlations of 3d electrons on the width of the band gap of a crystal is revealed. It is found that in the absence of pressure and without considering strong correlations of the d electrons of Ni and Mn, the crystal is characterized by a very narrow, indirect band gap with a Fermi level in the conduction band. In the absence of pressure, the inclusion in the calculation of strong correlations leads for carriers with spin down to a classical semiconductor with a Fermi level in the forbidden band. The inclusioin of strong correlations and pressures leads to an immersion of the Fermi level in the valence band. Calculations of the electronic properties of a NiMnAs crystal under the hydrostatic pressure were performed for the first time.

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