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Incommensurate spin-peierls phases in the one-dimensional quantum isotropic<i>XY</i>model
Abstract Using the numerical approach for a study of the thermodynamic properties of the nonuniform one-dimensional spin-1/2 isotropic XY model in a transverse field we examine different lattice distortions to reveal which spin-Peierls phases are realized in the magnetic chain at zero temperature in the presence of external field.