Transient state and steady-state magnetization in a one-dimensional magnet after the application of a magnetic field
A. A. ZvyaginB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovYa. Yu. SegalB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, KharkovV. M. TsukernikB. I. Verkin Physicotechnical Institute of Low Temperatures, Ukrainian Academy of Sciences, Kharkov
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The response of the uniaxial two-sublattice and the biaxial one-sublattice X–Y models to a steplike variation of the applied magnetic field oriented along the z-axis is considered. It is shown that the variation of the magnetization does not depend on the magnitude of the finite field under certain conditions (the biaxial one-sublattice X–Y model in the ground state, the initial field tends to infinity). Besides, it is shown that in contrast to static susceptibility, the dynamic susceptibility of the biaxial one-sublattice X–Y model has a jump at a certain value of the magnetic field at a nonzero temperature.
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