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Ferromagnetic ordering in UFe 0.5 Ni 0.5 Al
Author(s) -
Tran V. H.,
Troć R.,
André G.,
Bourée F.,
Baenitz M.
Publication year - 2003
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200301678
Subject(s) - ferromagnetism , condensed matter physics , magnetic moment , magnetism , neutron diffraction , specific heat , magnon , materials science , crystallography , crystal structure , chemistry , physics
The alloy UFe 0.5 Ni 0.5 Al crystallizing in the hexagonal ZrNiAl‐type structure has been studied by means of neutron powder diffraction and specific heat measurements. The Ni atoms occupy preferentially the (1b) sites. The transition into a ferromagnetic state at T C ∼ 55 K reported previously is corroborated by the occurrence of specific heat anomaly and magnetic reflections. The magnetic structure consists of the ferromagnetic (001)‐planes with the magnetic moments parallel to the c ‐axis. At 1.4 K, the ordered uranium moment is about 0.6 μ B . The low‐temperature dependence of C p may be described by an expression involving an energy gap in the magnon spectrum. The electronic coefficient of the specific heat is modestly enhanced and amounts to about 47 mJ/mol K 2 . This feature together with a small value of μ ord point to the strongly 5f–d hybridized character of the magnetism in UFe 0.5 Ni 0.5 Al.