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Mössbauer study of iron ordering in mixed valence system LuFe 2 O 4
Author(s) -
Bang Bong Kyu,
Kim Sung Baek,
Cheong SW.,
Kim Chul Sung
Publication year - 2007
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.200777180
Subject(s) - mössbauer spectroscopy , magnetic moment , diffractometer , valence (chemistry) , crystallography , analytical chemistry (journal) , magnetometer , chemistry , curie temperature , charge ordering , crystal structure , ion , materials science , spectral line , ferromagnetism , condensed matter physics , magnetic field , charge (physics) , physics , organic chemistry , chromatography , quantum mechanics , astronomy
Single crystalline LuFe 2 O 4 was grown by the floating zone method. The crystallographic and magnetic properties of the sample were measured using x‐ray diffractometer (XRD), Mössbauer spectroscopy, and vibrating sample magnetometer (VSM). The crystal structure was found to be a two‐dimensional layered‐type rhombohedral with space group R3‐mh . The magnetic Curie temperature ( T C ) was determined to be 250 K from the M ‐ T curve and Mössbauer spectra. Just below T C , the magnetic moment has large value and shows a abrupt change in M ‐ T curve. The Mössbauer spectra have been taken at various temperatures ranging from 4.2 to 370 K. We confirmed that the charge ordering of Fe 3+ and Fe 2+ ions was begun below 350 K, magnetic superstructure of the different ionic state was formed around 320 K. The isomer shift value of Fe 2+ doublet increases with decreasing temperature from 320 to 235 K. At low temperature, Mössbauer spectra consisted of four sextets with magnetic ordering. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)