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Thermodynamics of the Spin-1/2 Antiferromagnetic Uniform Heisenberg Chain | | A. Klümper
; D. C. Johnston
; | | Date: |
9 Feb 2000 | | Subject: | cond-mat | | Abstract: | We present a new application of the traditional thermodynamic Bethe ansatz to the spin-1/2 antiferromagnetic uniform Heisenberg chain and derive exact nonlinear integral equations for just {em two} functions describing the elementary excitations. Using this approach the magnetic susceptibility $chi$ and specific heat C versus temperature T are calculated to high accuracy for $5 imes10^{-25}leq T/Jleq 5$. The $chi(T)$ data agree very well at low T with the asymptotically exact theoretical low-T prediction of S. Lukyanov, Nucl. Phys. B {f 522}, 533 (1998). The unknown coefficients of the second and third lowest-order logarithmic correction terms in Lukyanov’s theory for C(T) are estimated from the C(T) data. | | Source: | arXiv, cond-mat/0002140 | | Services: | Forum | Review | PDF | Favorites | |
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