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Phenomenological description of dynamics in a diluted anisotropic heisenberg paramagnet at high temperatures
Author(s) -
TahirKheli R. A.,
Kawasaki K.
Publication year - 1977
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.2220790203
Subject(s) - isotropy , anisotropy , paramagnetism , condensed matter physics , ising model , transverse plane , physics , heisenberg model , spin (aerodynamics) , correlation function (quantum field theory) , lattice (music) , limiting , statistical physics , mathematical physics , quantum mechanics , antiferromagnetism , thermodynamics , mechanical engineering , structural engineering , acoustics , dielectric , engineering
Abstract A recent work on space and time dependent spin correlation function for a diluted isotropic Heisenberg paramagnet at infinite temperature is generalized in two important directions: firstly, now also lattices are considered which, admit nearest neighbour triangles, e.g. f.c.c. lattice, and, secondly, now the exchange interaction is allowed to be uni‐axially Anisotropic. The latter generalization necessitates the consideration of two different types of spin‐correlations: longitudinal and transverse. As limiting cases, the longitudinal correlation is examined for XY model and the transverse spin correlation for the Ising model. Between these limits, correlations are computed for J 0 / J + = 2 and 0.5, for several concentrations, and the results are compared with those for the isotropic case, i.e. J 0 / J + = 1.