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Magnetic interactions in NiSO 4
Author(s) -
Scheerlinck D.,
Peetroons C.,
Speybrouck P.,
Hautecler S.,
Michel K.
Publication year - 1975
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.2220720236
Subject(s) - paramagnetism , physics , magnetic moment , range (aeronautics) , exchange interaction , moment (physics) , energy exchange , condensed matter physics , neutron , energy (signal processing) , state (computer science) , computation , function (biology) , chemistry , atomic physics , ferromagnetism , materials science , nuclear physics , quantum mechanics , mathematics , atmospheric sciences , algorithm , evolutionary biology , composite material , biology
The energy distributions of neutrons scattered by NiS0 4 in its paramagnetic state are measured by means of a time‐of‐flight technique. Restricting the range of the exchange interactions to the first and second nearest‐neighbours, the relation ( J 1 / k B ) 2 + 2( J 2 / k B ) 2 = = (149±7) °K 2 is obtained from the second moment of these energy distributions. A second relation between the two exchange parameters is obtained from a computation of the Néel temperature in the Green's function approximation. From the two relations J 1 / k B = = (8 ± 0.8) °K and J 2 / k B = (−6.5 ± 0.6) °K are derived. Taking properly into account a temperature‐independent contribution to the susceptibility, no experimental indication is found that there are other significant exchange interactions.