N. Hasselmann, A. H. Castro Neto, C. Morais Smith
Published 2000-05-28, updated 2001-12-03Version 2
We propose that the spin glass phase of cuprates is due to the proliferation of topological defects of a spiral distortion of the antiferromagnet order. Our theory explains straightforwardly the simultaneous existence of short range incommensurate magnetic correlations and complete a-b symmetry breaking in this phase. We show via a renormalization group calculation that the collinear O(3)/O(2) symmetry is unstable towards the formation of local non-collinear correlations. A critical disorder strength is identified beyond which topological defects proliferate already at zero temperature.
Comments: 7 pages, 2 figures. Final version with some changes and one replaced figure
Journal: Europhysics Letters, V.56, No.6, 15th December 2001, pp. 870-876
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