Specific features of spin ordering in an Ising antiferromagnet with single-ion easy-plane anisotropy |
| |
Authors: | V M Kalita G Yu Lavanov V M Loktev |
| |
Institution: | (1) National Technical University of Ukraine “Kiev Polytechnic Institute”, pr. Peremohy 37, Kiev, 03056, Ukraine;(2) Institute of Physics, National Academy of Sciences of Ukraine, pr. Nauki 46, Kiev, 03028, Ukraine;(3) Bogolyubov Institute for Theoretical Physics, National Academy of Sciences of Ukraine, ul. Metrolohichna 14b, Kiev, 03143, Ukraine |
| |
Abstract: | A thermodynamic analysis of spin ordering in an Ising antiferromagnet with single-ion easy-plane anisotropy is carried out. The solutions of the equations of state are analyzed, and the phase diagram is constructed. It is shown that an increase in the single-ion anisotropy constant as a result of increasing competition between single-ion anisotropy and exchange interaction brings about a crossover from the continuous phase transition to the abrupt phase transition. This is initiated by a change in the ion state populations due to single-ion anisotropy and by the freezing of ionic states with a nonzero spin projection. An increase in the single-ion anisotropy also leads to a crossover of the phase transformation between the paramagnetic and antiferromagnetic states from the order-disorder to order-order type. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|