Geodesic
Temperature correlators of the $XXZ$ Heizenberg magnet at $\Delta=-\infty$
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 16, Tome 269 (2000), pp. 43-61

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The one-dimensional $XXZ$ Heizenberg magnet at $\Delta=-\infty$ is considered and time-dependent temperature correlation function of $z$-components of local spins is calculated. In the thermodynamic limit the correlation function is expressed through Fredholm determinants of linear integral operators. 
@article{ZNSL_2000_269_a3,
     author = {N. I. Abarenkova and A. G. Pronko},
     title = {Temperature correlators of the $XXZ$ {Heizenberg} magnet at $\Delta=-\infty$},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {43--61},
     publisher = {mathdoc},
     volume = {269},
     year = {2000},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2000_269_a3/}
}
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N. I. Abarenkova; A. G. Pronko. Temperature correlators of the $XXZ$ Heizenberg magnet at $\Delta=-\infty$. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 16, Tome 269 (2000), pp. 43-61. http://geodesic.mathdoc.fr/item/ZNSL_2000_269_a3/