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Magnetic Properties of Tb 2 O 2 SO 4
Author(s) -
Kasten A.,
Hess G.
Publication year - 1984
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.2221230115
Subject(s) - ferrimagnetism , condensed matter physics , superexchange , magnetization , antiferromagnetism , zeeman effect , dipole , antiparallel (mathematics) , saturation (graph theory) , chemistry , magnetic moment , magnetic field , physics , mathematics , organic chemistry , quantum mechanics , combinatorics
Below T N = 3.9 K Tb 2 O 2 SO 4 is antiferromagnetic with canted moments. In the ordered phase, two of the four neighbouring moments are antiparallel and two nearly perpendicular to that of a central ion. The angular dependence of magnetisation, magnetic susceptibility, and spectroscopic Zeeman effect is analysed and the interaction constants (dipole and superexchange) are derived. The crystal field splitting of the two lowest Tb 3+ states seems to be vanishingly small. Mean field calculations for applied external fields yield a variety of ferrimagnetic phases with various fractions of the saturation magnetisation, depending on temperature and field direction.