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Magnetic Relaxation in the Heisenberg Spin Glass
Author(s) -
Schreiber J.,
Schulz D.
Publication year - 1988
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.2221450236
Subject(s) - relaxation (psychology) , magnetic relaxation , condensed matter physics , isothermal process , spin glass , exponential function , physics , spin–spin relaxation , spin (aerodynamics) , magnetic field , spin–lattice relaxation , quantum mechanics , magnetization , thermodynamics , paramagnetism , mathematics , psychology , social psychology , mathematical analysis
On the basis of a dynamical theory for Heisenberg spin glasses the isothermal magnetic relaxation R(t) = M(t)/H after switching off a magnetic field H at t = 0 is calculated. The extreme short time relaxation shows an exponential decay with a temperature dependent relaxation time τ( T ) and is essentially influenced by many‐body quantum effects in the spin glass state. An estimation of the long time relaxation yields in the qualitative agreement to experimental investigation a non‐exponential behaviour R(t) ∼ t −1/γ , where γ = 2 in an intermediate time region is found for T ≦ T f . This anomalous relaxation is caused by a broad distribution of relaxation times owing to a distribution of local fields.