Topological defects and the spin glass phase of cuprates

Author： Hasselmann N.   Castro Neto A. H.   Morais Smith C.  

Publisher： Edp Sciences

E-ISSN： 1286-4854|56|6|870-876

ISSN： 0295-5075

Source： EPL (EUROPHYSICS LETTERS), Vol.56, Iss.6, 2010-03, pp. : 870-876

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Abstract

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 breakingin this phase. We show via a renormalization group calculation that the collinear O(3)/O(2) symmetry is unstable towardsthe formation of local non-collinear correlations.A critical disorder strength is identified beyond which topological defectsproliferate already at zero temperature.

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