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Weak magnetism in insulating and superconducting cuprates (Articolo in rivista)

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Weak magnetism in insulating and superconducting cuprates (Articolo in rivista) (literal)

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De Luca, G. M. and Ghiringhelli, G. and Moretti Sala, M. and Di Matteo, S. and Haverkort, M. W. and Berger, H. and Bisogni, V. and Cezar, J. C. and Brookes, N. B. and Salluzzo, M. (2010)
Weak magnetism in insulating and superconducting cuprates
in Physical review. B, Condensed matter and materials physics; The American Physical Society, College Park, MD 20740-3844 (Stati Uniti d'America)
(literal)

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De Luca, G. M. and Ghiringhelli, G. and Moretti Sala, M. and Di Matteo, S. and Haverkort, M. W. and Berger, H. and Bisogni, V. and Cezar, J. C. and Brookes, N. B. and Salluzzo, M. (literal)

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G. M. De Luca,1, G. Ghiringhelli,2 M. Moretti Sala,2 S. Di Matteo,3 M. W. Haverkort,4 H. Berger,5 V. Bisogni,6 J. C. Cezar,6 N. B. Brookes,6 and M. Salluzzo1 1 CNR-SPIN, Complesso MonteSantangelo via Cinthia, 80126 Napoli, Italy 2 CNR-SPIN, Politecnico di Milano, piazza Leonardo da Vinci 32, 20133 Milano, Italy 3 Equipe de Physique des Surfaces et Interfaces, Institut de Physique de Rennes, UMR CNRS-UR1 6251, Université de Rennes 1, 35042 Rennes Cedex, France 4 Max Planck Institute for Solid State Research, Heisenbergstraße 1, D-70569 Stuttgart, Germany 5 Institut de Physique de la Matière Condensée, Ecole Polytechnique Féderale de Lausanne, 1015 Lausanne, Switzerland 6 European Synchrotron Radiation Facility, 6 rue Jules Horowitz, BP 220, F-38043 Grenoble Cedex, France (literal)

Titolo

Abstract

X-ray magnetic circular dichroism provides evidence of an out-of-plane spin moment in undoped and doped cuprates. In La(2)CuO(4) this moment is related to the canting of the antiferromagnetically ordered Cu(2+) spins caused by the Dzyaloshinskii-Moriya interaction within the CuO(2) planes. This canting gives rise to the well-known weak ferromagnetism in high magnetic fields. We find a similar behavior in doped compounds, both in the normal and in the superconducting state, but with a different temperature dependence typical of paramagnetic systems. This result suggests that, together with short-range in-plane antiferromagnetic correlations, the Dzyaloshinskii-Moriya interaction survives up to optimal doping and in the superconducting state. (literal)

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