TY - JOUR
T1 - Thermodynamics of integrable chains with alternating spins
AU - De Vega, H. J.
AU - Mezincescu, Luca
AU - Nepomechie, Rafael I.
PY - 1994
Y1 - 1994
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.49.13223
DO - 10.1103/PhysRevB.49.13223
M3 - Article
AN - SCOPUS:4243620898
VL - 49
SP - 13223
EP - 13226
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 2469-9950
IS - 18
ER -