The effects of a magnetic field in an integrable Heisenberg chain with mixed spins
- 21 December 1993
- journal article
- Published by IOP Publishing in Journal of Physics A: General Physics
- Vol. 26 (24) , 7301-7309
- https://doi.org/10.1088/0305-4470/26/24/008
Abstract
We discuss some properties of an integrable and conformally invariant Heisenberg chain with alternating spins S and S' (S'>S) in the presence of a magnetic field. The zero-field magnetic susceptibility is computed and turns out to be only dependent on the spin S. For small enough magnetic field, the low-lying excitations are related to the deformed SU(2) parafermionic field theory at levels 2S and 2(S'-S). Generalizations to these results for other mixed systems are commented on.Keywords
This publication has 18 references indexed in Scilit:
- Current algebra and Wess-Zumino model in two dimensionsPublished by Elsevier ,2002
- The class of universality of integrable and isotropic GL(N) mixed magnetsJournal of Physics A: General Physics, 1993
- Critical behaviour of integrable mixed-spin chainsJournal of Physics A: General Physics, 1993
- New integrable quantum chains combining different kinds of spinsJournal of Physics A: General Physics, 1992
- Critical theory of quantum spin chainsPhysical Review B, 1987
- Realization of a Witten Critical Theory inNMnPhysical Review Letters, 1986
- Universal term in the free energy at a critical point and the conformal anomalyPhysical Review Letters, 1986
- Exact solution of the isotropic Heisenberg chain with arbitrary spins: Thermodynamics of the modelNuclear Physics B, 1983
- The picture of low-lying excitations in the isotropic Heisenberg chain of arbitrary spinsPhysics Letters A, 1982
- One-Dimensional Heisenberg Model at Finite TemperatureProgress of Theoretical Physics, 1971