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Magnetostructural features of phase transitions in the Mn1-xCoxNiGe system Part 1. Experimental results
Mitsiuk V.I.1, Rimskiy G.S.1, Yanushkevich K.I.1, Koledov V.V.
2, Mashirov A.V.
2, Val'kov V.I.
3, Golovchan A.V.
3, Kovalev O.E.3
1Scientific and Practical Materials Research Center, National Academy of Sciences of Belarus, Minsk, Belarus
2Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
3Donetsk Institute for Physics and Engineering, Donetsk, Ukraine
2Kotelnikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Moscow, Russia
3Donetsk Institute for Physics and Engineering, Donetsk, Ukraine
Email: valkov09@gmail.com
Experimental studies of the magnetic and structural properties of solid solutions of the Mn1-xCoxNiGe system in a wide range of Co concentrations (0.05≤ x≤ 0.8), temperatures (5 K≤ x≤600 K) and magnetic fields (0.016 T≤ x≤ 13.5 T) have revealed a number of nontrivial magnetic and magnetocaloric features of this system. The latter include: 1) a change in the nature of magnetic phase transitions from magnetostructural transitions of the 1st order paramagnetism-antiferromagnetism (0.05≤ x≤ 0.15) to isostructural transitions of the 2nd order paramagnetism-ferromagnetism (0.15≤ x≤0.8) with a change in the concentration of Co ; 2) anomalous behavior of low-temperature regions of magnetization in weak magnetic fields; 3) a change in the saturation magnetization and the appearance of irreversible magnetic field-induced transitions at helium temperatures in strong magnetic fields. Keywords: irreversible magnetostructural first-order phase transition, helimagnetism, direct and inverse magnetocaloric effects.
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