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Abstract: We study the magnetocaloric effect for the integrable antiferromagnetichigh-spin chain. We present an exact computation of the Gr\-uneisen parameter,which is closely related to the magnetocaloric effect, for the quantum spin-schain on the thermodynamical limit by means of Bethe ansatz techniques and thequantum transfer matrix approach. We have also calculated the entropy S and theisentropes in the H,T plane. We have been able to identify the quantumcritical points H c^{s}=2-s+1-2 looking at the isentropes and-or thecharacteristic behaviour of the Gr\-uneisen parameter.



Autor: G.A.P. Ribeiro

Fuente: https://arxiv.org/







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