Solitons in one-dimensional antiferromagnetic chains

Journal Article · Sat Apr 01 00:00:00 EST 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.7149· OSTI ID:6153703

Pires, A S.T.; Talim, S L; Costa, B V

We study the quantum-statistical mechanics, at low temperatures, of a one-dimensional antiferromagnetic Heisenberg model with two anisotropies. In the weak-coupling limit we determine the temperature dependences of the soliton energy and the soliton density. We have found that the leading correction to the sine-Gordon (SG) expression for the soliton density and the quantum soliton energy comes from the out-of-plane magnon mode, not present in the pure SG model. We also show that when an external magnetic field is applied, the chain supports a new type of kink, where the sublattices rotate in opposite directions.

• Research Organization: Universidade Federal de Minas Gerais, Departamento de Fisica, CP 702, Belo Horizonte, Minas Gerais, 30161, Brazil
• OSTI ID: 6153703
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Vol. 39:10
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIFERROMAGNETIC MATERIALS
PARTICLE MODELS
SOLITONS
THERMODYNAMIC PROPERTIES
EXCITATION
HEISENBERG MODEL
STATISTICAL MECHANICS
CRYSTAL MODELS
ENERGY-LEVEL TRANSITIONS
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
PHYSICAL PROPERTIES
QUASI PARTICLES
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