Metamagnetic Phase Transitions in La1−x Nd x Mn2Si2
Tóm tắt
Experimental measurements for the magnetization at various temperatures are analyzed using a mean field model for the purely ferromagnetic spin configuration near the metamagnetic phase transitions in La1−x
Nd
x
Mn2Si2 (x=0.3) at a constant magnetic field (50 mT). By fitting the temperature dependence of the magnetization from the free energy in the mean field model to the experimental data for this compound, the coefficients in the free energy expansion are determined. Our analysis of the magnetization describes a first-order character of the metamagnetic transition in La1−x
Nd
x
Mn2Si2 (x=0) on the basis of the mean field model studied here.
Tài liệu tham khảo
Duman, E., Acet, M., Dincer, I., Elmali, A., Elerman, Y.: Competing magnetic interactions in rare-earth manganese silicides and germanides. J. Magn. Magn. Mater. 309, 40–53 (2007)
Moriya, T., Usami, K.: Coexistence of ferro- and antiferromagnetism and, phase transitions in itinerant electron systems. Solid State Commun. 23, 935–938 (1977)
Brabers, J.H.V.J., Nolten, A.J., Kayzel, F., Lenczowski, S.H.J., Buschow, K.H.J., De Boer, F.R.: Strong Mn–Mn distance dependence of the Mn interlayer coupling in SmMn2Ge2-related compounds and its role in magnetic phase transitions. Phys. Rev. B 50(22), 16410–16417 (1994)
Brabers, J.H.V.J., Buschow, K.H.J., De Boer, F.R.: Field-induced first-order antiferromagnetic–ferromagnetic transitions in RMn2Ge2 compounds and their relation to the magnetostriction of the Mn sublattice. Phys. Rev. B 59(14), 9314–9323 (1999)
Dincer, I., Elerman, Y., Elmali, A., Ehrenberg, H., André, G.: Neutron diffraction study of the La1−x Pr x Mn2Si2 (x=0.4, 0.7 and 1) compounds and the general description of the magnetic behavior of Mn in RMn2Ge2 and RMn2Si2. J. Magn. Magn. Mater. 313(2), 342–353 (2007)