Volume 56, Number 6, December 2001
|Page(s)||870 - 876|
|Section||Condensed matter: electronic structure, electrical magnetic and optical properties|
|Published online||01 December 2003|
Topological defects and the spin glass phase of cuprates
Max-Planck-Institut für Physik komplexer Systeme
Nöthnitzer Str. 38, D-01187 Dresden, Germany
2 Department of Physics, Boston University - Boston MA 02215, USA
3 Institut de Physique Théorique - Pérolles, CH-1700 Fribourg, Switzerland
Accepted: 8 October 2001
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.
PACS: 75.10.Nr – Spin-glass and other random models / 75.50.Ee – Antiferromagnetics
© EDP Sciences, 2001
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