Magnetic and thermal properties of alloys close in composition to the spin gapless semiconductor Mn2CoAl
| Autor: | A. A. Semiannikova, E. B. Marchenkova, A. V. Korolev, Yu. A. Perevozchikova, V. V. Marchenkov, N. I. Kourov, A. N. Domozhirova, P. S. Korenistov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TEMPERATURE DEPENDENCE
Materials science ALUMINUM ALLOYS Physics and Astronomy (miscellaneous) COBALT ALLOYS General Physics and Astronomy TERNARY ALLOYS 01 natural sciences IN COMPOSITIONS FIELD DEPENDENCE Paramagnetism symbols.namesake Magnetization 0103 physical sciences 010306 general physics Spin (physics) DENSITY OF STATE Debye model 010302 applied physics PARAMAGNETIC SUSCEPTIBILITY Condensed matter physics MANGANESE ALLOYS SPECIFIC HEAT Fermi level MAGNETIZATION Magnetic susceptibility TUNGSTEN ALLOYS Magnetic field FERROMAGNETS TEMPERATURE DISTRIBUTION Density of states symbols STONER MODEL MAGNETIC SUSCEPTIBILITY TEMPERATURE INDEPENDENTS |
| Zdroj: | Low Temp. Phys Low Temperature Physics Scopus-Elsevier |
| DOI: | 10.1063/10.0002900&partnerID=40&md5=709749f181007e355c8a8163f39b4744 |
| Popis: | 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. © 2021 Author(s). The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation (theme “Spin” No. AAAA-A18-118020290104-2), was supported in part by the Russian Foundation for Basic Research (projects Nos. 18-02-00739 and 20-32-90065) and by the Government of the Russian Federation (decision No. 211, contract No. 02.A03.21.0006). The authors would like to thank D. A. Shishkin and P. B. Terentyev for measuring the magnetic properties of alloys at high temperatures. |
| Databáze: | OpenAIRE |
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