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Superparamagnetic Relaxation in Cu 0.5 Fe 0.5 Cr 0.5 Rh 1.5 S 4
Author(s) -
Oak Hang Nam,
Baek Kyung Seon,
Cho Byung Chul
Publication year - 1998
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/(sici)1521-3951(199806)207:2<479::aid-pssb479>3.0.co;2-t
Subject(s) - superparamagnetism , spinel , lattice constant , materials science , relaxation (psychology) , mössbauer spectroscopy , diffraction , crystal structure , nuclear magnetic resonance , condensed matter physics , analytical chemistry (journal) , magnetization , crystallography , chemistry , metallurgy , magnetic field , optics , psychology , social psychology , physics , chromatography , quantum mechanics
Cu 0.5 Fe 0.5 Cr 0.5 Rh 1.5 S 4 has been studied by Mssbauer spectroscopy, X‐ray diffraction and magnetic measurements. The crystal structure is found to be a cubic spinel with lattice constant a 0 = 9.884 Å. The iron ions are in ferric states and occupy the tetrahedral sites. As the temperature increases toward the Néel temperature, line broadening and a pronounced central peak appear, suggesting superparamagnetic relaxation. As the temperature increases, the relaxation rate increases rapidly with a tenth power of the absolute temperature.