Topological Defects and the Spin Glass Phase of Cuprates

Details Topological Defects and the Spin Glass Phase of Cuprates Topological Defects and the Spin Glass Phase of Cuprates

2000-05-28

arxiv.org/abs/cond-mat/0005486v2

Europhysics Letters, V.56, No.6, 15th December 2001, pp. 870-876

Physics

Condensed Matter

Disordered Systems and Neural Networks

7 pages, 2 figures. Final version with some changes and one replaced figure

Scientific paper

10.1209/epl/i2001-00600-6

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.

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