1. Magnetic and thermal properties of alloys close in composition to the spin gapless semiconductor Mn2CoAl.
- Author
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Semiannikova, A. A., Kourov, N. I., Korolev, A. V., Perevozchikova, Yu. A., Marchenkova, E. B., Korenistov, P. S., Domozhirova, A. N., and Marchenkov, V. V.
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MAGNETIC properties , *THERMAL properties , *MAGNETIC susceptibility , *ALLOYS , *NARROW gap semiconductors , *HEAT capacity - Abstract
The field dependence of magnetization at T = 4.2 K and in magnetic fields of up to 70 kOe, temperature dependences of magnetization (2 K < T < 300 K), heat capacity (2 K < T < 30 K) and magnetic susceptibility (2 K < T < 1000 K) for Mn1.99Co0.96Al1.05 and Mn1.79Co1.25Al0.96 alloys, closed in composition to the Mn2CoAl spin gapless semiconductor, were studied. Alloys studied were demonstrated to be the band ferromagnets. Their high-field (H > 11 kOe) magnetization is described in the Stoner models with the Rhodes-Wohlfarth parameter pRW = 1.3 for Mn1.99Co0.96Al1.05 and pRW = 2.3 for Mn1.79Co1.25Al0.96. When the composition deviates from the stoichiometric Mn2CoAl, the spontaneous moment decreases slightly, the effective moment, on the contrary, increases. In this case, a negative sign of the temperature-independent component of the paramagnetic susceptibility is observed. The density of states n(EF) at Fermi level and the Debye temperature ΘD of studied alloys have the usual values for 3d-metal alloys. [ABSTRACT FROM AUTHOR]
- Published
- 2021
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