Effective Masses of Carriers in the Degenerate Conduction Band: Interplay of Density of Electronic States Peculiarities and Magnetization

Authors O.I. Kramar, Yu.L. Skorenkyy, Yu.M. Dovhopyaty

Ternopil Ivan Puluj National Technical University, 56, Ruska St., 46001 Ternopil, Ukraine

Е-mail kramar@tu.edu.te.ua
Issue Volume 11, Year 2019, Number 5
Dates Received 17 June 2019; revised manuscript received 22 October 2019; published online 25 October 2019
Citation O.I. Kramar, Yu.L. Skorenkyy, Yu.M. Dovhopyaty, J. Nano- Electron. Phys. 11 No 5, 05030 (2019)
DOI https://doi.org/10.21272/jnep.11(5).05030
PACS Number(s) 71.10.Fd, 72.15.−v, 72.25.Ba
Keywords Mott-Hubbard ferromagnet, Degenerate conduction band, Effective masses of carriers, Density of electronic states.

For various DOS forms, it has been found that physically different regimes (of weak and strong magnetic field) can be realized in the concentration dependence of effective masses. In a weak field, despite the spin splitting occurrence due to translational mechanism of ferromagnetic order stabilization, a sharp change of the effective mass splitting exists for arbitrary electron concentrations, which can be utilized for tuning of the spin polarization by the external field. When the magnetic field is comparatively strong, the correlation band narrowing factor controls the critical concentration for the conduction type change. The DOS form governs the concentration dependence of transport characteristics, therefore the use of a realistic DOS for modeling of a spontaneous or magnetic field-induced ferromagnetic order is of importance.

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