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Magnetic Properties and Critical Behaviour of the B‐Spinel CdCr 2x In 2—2x S 4 (0.9 ≤ x ≤ 1)
Author(s) -
Hamedoun M.,
Houssa M.,
Cherriet Y.,
Bakkali F. Z.
Publication year - 1999
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(199908)214:2<403::aid-pssb403>3.0.co;2-4
Subject(s) - spinel , critical exponent , dilution , condensed matter physics , heisenberg model , thermodynamics , magnetic field , series (stratigraphy) , physics , chemistry , materials science , mathematics , quantum mechanics , antiferromagnetism , phase transition , geology , paleontology , metallurgy
We study the magnetic properties and the critical behaviour of the B‐spinel CdCr 2 x In 2—2 x S 4 systems in the range of concentration 0.9 ≤ x ≤ 1. Using the mean‐field theory combined with the probability distribution of interaction, the exchange integrals were calculated up to the second nearest neighbours. The critical temperature and the critical exponents for the magnetic sysceptibility and the correlation length γ and ν, respectively, are deduced by applying the high‐temperature series expansion (HTS) extrapolated with the Padé approximants (PA) method. The obtained values of T c are in good agreement with those predicted by the magnetic measurements. The values of γ and ν are sensitive to the dilution ratio x . For the compounds situated in the region 0.98 ≤ x ≤ 1, they are close to those of the 3D Heisenberg model. For the concentration x = 0.9, γ and ν deviate slowly from the values predicted by this model and approach the values found in re‐entrant systems.