Abstract
The effect of impurity-induced states on the long range order in a lamellar antiferromagnet (AF) is studied and the magnetic phase-diagram of a lightly doped La2−x Sr x CuO4 is proposed. It is shown that long range magnetic perturbations and the layered structure cause the shrinkage of AF domain on the phase diagram and lead to the reentrant AF transition. A nonmonotonous dependence of the correlation length ξ2D on temperatureT is obtained; the dependence ξ2D (x) is exponential for highT and ξ2D ∼x 1/2 for lowT.
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Glazman, L.I., Ioselevich, A.S. Theory of the reentrant transition in a lamellar antiferromagnet: doped La2CuO4 . Z. Physik B - Condensed Matter 80, 133–137 (1990). https://doi.org/10.1007/BF01390660
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DOI: https://doi.org/10.1007/BF01390660