Abstract
Recently new integral equation describing the thermodynamics of XXZ chain was proposed. Using the integral equation we have succeded in obtaining the high temperature expansion of the specific heat and the magnetic susceptibility. For the ground state of spin one-half XXX chain only the first and the second neighbor correlations were known. Very recently we succeeded to calculate the third neighbor correlation by the direct calculation of integral formula. It is iexpressed by logarithm of 2 and Riemannian Zeta function with odd-integer arguments. We discuss the possibility of the fourth neighbor correlation and extention to XXZ chain.
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Takahashi, M. Thermodynamics and Correlation Functions of XXZ Chain. Czechoslovak Journal of Physics 53, 1125–1130 (2003). https://doi.org/10.1023/B:CJOP.0000010544.61770.02
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DOI: https://doi.org/10.1023/B:CJOP.0000010544.61770.02