Abstract
We consider a two-parameter (c̄,c) family of quantum integrable isotropic Hamiltonians for a chain of alternating spins of spin s=1/2 and s=1. We determine the thermodynamics for low-temperature T and small external magnetic field H, with TH. In the antiferromagnetic (c̄>0,c>0) case, the model has two gapless excitations. In particular, for c̄=c, the model is conformally invariant and has central charge cvir=2. When one of these parameters is zero, the Bethe ansatz equations admit an infinite number of solutions with lowest energy.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 13223-13226 |
| Number of pages | 4 |
| Journal | Physical Review B |
| Volume | 49 |
| Issue number | 18 |
| DOIs | |
| State | Published - Jan 1 1994 |
ASJC Scopus subject areas
- Condensed Matter Physics
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De Vega, H. J., Mezincescu, L., & Nepomechie, R. I. (1994). Thermodynamics of integrable chains with alternating spins. Physical Review B, 49(18), 13223-13226. https://doi.org/10.1103/PhysRevB.49.13223