Phase transition in a weakly disordered quasi-one-dimensional magnet material

The effect of fixed substitutional impurities on the magnetic field driven phase transition is considered in the one-dimensional X-Y model. It is shown that in the low-concentration region smearing of the singularity in the magnetic susceptibility is significantly attenuated when the relation (I′/I)2=/ μ′/μ is satisfied for the exchange constants and magnetons of the impurities and of the matrix.

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