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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2010

Weak magnetism in insulating and superconducting cuprates

Résumé

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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Dates et versions

hal-00910871 , version 1 (28-11-2013)

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G. M. de Luca, G. Ghiringhelli, M. Moretti Sala, Sergio Di Matteo, M. W. Haverkort, et al.. Weak magnetism in insulating and superconducting cuprates. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2010, 82, pp.214504. ⟨10.1103/PHYSREVB.82.214504⟩. ⟨hal-00910871⟩
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