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Spin‐Wave Theory on Quasi‐One‐Dimensional Heisenberg Antiferromagnets
Author(s) -
Du A.,
Wei G. Z.
Publication year - 1995
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.2221910223
Subject(s) - antiferromagnetism , condensed matter physics , spins , ferromagnetism , magnetization , physics , coupling (piping) , spin (aerodynamics) , ground state , spin wave , internal energy , heisenberg model , perpendicular , materials science , quantum mechanics , magnetic field , thermodynamics , geometry , mathematics , metallurgy
Abstract The low‐temperature of quasi‐one‐dimensional Heisenberg antiferromagnets with ferromagnetic coupling between nerest‐neighbor spins within a chain and antiferromagnetic couplng between nearest‐neighbor spins withina chain and antiferromagnetic coupling between chains are studied by the spin‐wave theory. The effects of interchain coupoling on the ground state energy, sublattice magnetization, and perpendicular susceptibility at zero temperture are calculated numerically. At low temperatures, asympototic expressions of sublattice magnetization, internal energy, magnetic specific heat, parallel and perpendicular susceptibilities are given as functions of temperature and interchain coupling strength within tow sub‐temerature regions. It is found that if interchain coupling is weak, with increasing temperature the properties of the system change from threedimensional behavior (Δ m ∝ T 2 , Δ E ∝ T 4 , C m ∝ T 3 , X ∥ ∝ T 5/2 , Δ X ⊥ ∝ T 2 ) To quasi‐one‐dimensional bahavior (Δ m ∝ T , Δ E ∝ T 3/2 , C m ∝ T 1/2 , X ∥ ∝ T 3/2 , Δ X ⊥ ∝ T ).