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Two‐Dimensional Quantum Antifferomagnet in a Strong Magnetic Field. The Case of Spin 1/2
Author(s) -
Gluzman S.
Publication year - 1993
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.2221760123
Subject(s) - condensed matter physics , physics , antiferromagnetism , saturation (graph theory) , quantum phase transition , magnetic field , ferromagnetism , square lattice , quantum , transverse magnetic , phase transition , quantum mechanics , mathematics , ising model , combinatorics
The problem of the two‐dimensional quantum antiferromagnet of spin 1/2 on a square lattice in a strong transverse magnetic field close to saturation is studied in terms of the equivalent Bose gas problem. The existence of a soft sound‐like mode and of a phase transition from the state with specific canted magnetic structure to the disordered ferromagnetic state is demonstrated. The expressions for thermodynamical and magnetic characteristics are derived.