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Magnetic critical behavior of Mn 5 Ge 3 ribbons
Author(s) -
Zheng T. F.,
Shi Y. G.,
Li J. B.,
Fan J. Y.,
Shi D. N.,
Lv L. Y.,
Tang S. L.
Publication year - 2013
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.201248474
Subject(s) - critical exponent , widom scaling , magnetization , exponent , condensed matter physics , anisotropy , scaling , materials science , physics , thermodynamics , mathematics , phase transition , magnetic field , quantum mechanics , geometry , linguistics , philosophy
Magnetic critical behavior of Mn 5 Ge 3 ribbons was investigated by dc magnetization measurements. The critical exponents were obtained by a modified Arrott plot technique and the Kouvel–Fisher method. Finally, β = 0.372 ± 0.003 and γ = 1.05 ± 0.01 were determined. The exponent δ = 3.88 ± 0.02 obtained from the magnetization isotherm of T C fulfills the Widom scaling relation δ = 1 + γ / β . Moreover, with these exponents, the magnetization curves collapse into two independent curves following a single equation around T C . These results confirm the reliability of the obtained critical exponents. However, this set of exponents belongs to none of the classical theoretical models. This phenomenon is probably caused by the anisotropy of the Mn ions.