Geodesic
Role of four-spin exchange in a~magnetic mechanism of superconductivity in cuprates
Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 4 (2011) no. 2, pp. 191-194

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Amendments to the exchange interaction can alter the superconducting transition temperature, so on the basis of numerical self-consistent solution of two equations in the framework of the $t$-$J$ model, we investigate the influence of the four spin exchange on the concentration dependence of the transition temperature to the superconducting phase with $d_{x^2-y^2}$ – the type of symmetry of the order.
Keywords: strong electron correlation, Hubbard model, $t$-$J$ model. 
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     author = {Alexander V. Shnurenko and Sergey G. Ovchinnikov and Elena I. Shneyder},
     title = {Role of four-spin exchange in a~magnetic mechanism of superconductivity in cuprates},
     journal = {\v{Z}urnal Sibirskogo federalʹnogo universiteta. Matematika i fizika},
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     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {2011},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/JSFU_2011_4_2_a6/}
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Alexander V. Shnurenko; Sergey G. Ovchinnikov; Elena I. Shneyder. Role of four-spin exchange in a~magnetic mechanism of superconductivity in cuprates. Žurnal Sibirskogo federalʹnogo universiteta. Matematika i fizika, Tome 4 (2011) no. 2, pp. 191-194. http://geodesic.mathdoc.fr/item/JSFU_2011_4_2_a6/