Solitons in one-dimensional antiferromagnetic chains

Journal Article · Sat Apr 01 04:00:00 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), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:10; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104* -- Metals & Alloys-- Physical Properties
657000 -- Theoretical & Mathematical Physics
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANTIFERROMAGNETIC MATERIALS
CRYSTAL MODELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
HEISENBERG MODEL
MAGNETIC MATERIALS
MATERIALS
MATHEMATICAL MODELS
MECHANICS
PARTICLE MODELS
PHYSICAL PROPERTIES
QUASI PARTICLES
SOLITONS
STATISTICAL MECHANICS
THERMODYNAMIC PROPERTIES