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Low‐temperature properties of a mixed spin Heisenberg ferrimagnetic system on a honeycomb lattice
Author(s) -
Li Jun,
Du An,
Wei Guozhu
Publication year - 2003
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.200301892
Subject(s) - ferrimagnetism , condensed matter physics , anisotropy , spin wave , lattice (music) , heisenberg model , spin (aerodynamics) , physics , anisotropy energy , honeycomb , ferromagnetism , magnetic anisotropy , chemistry , materials science , magnetization , quantum mechanics , magnetic field , thermodynamics , acoustics , composite material
The low‐temperature properties of a mixed spin‐2 and spin‐5/2 Heisenberg ferrimagnetic system on a honeycomb lattice are studied using a linear spin‐wave theory. The magnetizations and the internal energy at zero and low temperature, the spin‐wave spectrum, and the specific heat are calculated. The effects of the interlayer interaction and the anisotropy are discussed. It is found that the spin‐wave spectrum breaks into two optical branches from the effects of the anisotropy and there is no expected acoustical branch when there is single‐ion anisotropy. (© 2003 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)