Weak magnetism in insulating and superconducting cuprates

X-ray magnetic circular dichroism provides evidence of an out-of-plane spin moment in undoped and doped cuprates. In La2CuO4 this moment is related to the canting of the antiferromagnetically ordered Cu2+ spins caused by the Dzyaloshinskii-Moriya interaction within the CuO2 planes. This canting give...

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1. Verfasser: Haverkort, Maurits W. (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 3 December 2010
In: Physical review. B, Condensed matter and materials physics
Year: 2010, Jahrgang: 82, Heft: 21, Pages: 214504
ISSN:1550-235X
DOI:10.1103/PhysRevB.82.214504
Online-Zugang:Verlag, Volltext: http://dx.doi.org/10.1103/PhysRevB.82.214504
Verlag, Volltext: https://link.aps.org/doi/10.1103/PhysRevB.82.214504
Volltext
Verfasserangaben:G.M. De Luca, G. Ghiringhelli, M. Moretti Sala, S. Di Matteo, M.W. Haverkort, H. Berger, V. Bisogni, J.C. Cezar, N.B. Brookes, and M. Salluzzo

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520 |a X-ray magnetic circular dichroism provides evidence of an out-of-plane spin moment in undoped and doped cuprates. In La2CuO4 this moment is related to the canting of the antiferromagnetically ordered Cu2+ spins caused by the Dzyaloshinskii-Moriya interaction within the CuO2 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. 
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