Abstract
The effect of a spiral spin structure on superconducting (SC) pairing in a three-band Hubbard model related to Sr2RuO4 is analyzed in the mean-field approximation. Such a structure with incommensurate vector Q=2π (1/3, 1/3) is the simplest one that removes the nesting instability of α and β bands. It is assumed that there is an intralayer pairing interaction between two types of neighbor sites, those with attraction in a singlet channel and with attraction in both two-singlet and triplet channels. In both cases, a mixed singlet-triplet SC order is observed in the γ band: a d-wave singlet order is accompanied by the formation of p-wave triplet pairs (k,-k-Q)⇈ and (k,−k+Q)⇊ with large total momenta ∓Q and the spin projections ±1 onto an axis perpendicular to the spin rotation plane of the spiral spin structure. Both the SC and normal states are states with broken time-reversal symmetry. In contradiction to the experiment, the models give different scales of T c for the γ band and for α and β bands. This fact shows that the models with intralayer interactions or with the spin structure assumed are insufficient.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 123, No. 6, 2003, pp. 1286–1296.
Original Russian Text Copyright © 2003 by Ovchinnikova.
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Ovchinnikova, M.Y. Coexistence of superconducting and spiral spin orders: Models of ruthenate. J. Exp. Theor. Phys. 96, 1131–1139 (2003). https://doi.org/10.1134/1.1591225
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DOI: https://doi.org/10.1134/1.1591225