1. Weak magnetism in insulating and superconducting cuprates
- Author
-
Giacomo Claudio Ghiringhelli, Julio C. Cezar, S. Di Matteo, Maurits W. Haverkort, G. M. De Luca, Valentina Bisogni, N. B. Brookes, Marco Salluzzo, Helmuth Berger, M. Moretti Sala, Politecnico di Milano [Milan] (POLIMI), Institut de Physique de Rennes (IPR), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique de la Matière Complexe, Ecole Polytechnique Fédérale de Lausanne (EPFL), European Synchrotron Radiation Facility (ESRF), De Luca, G. M., Ghiringhelli, G., Moretti Sala, M., Di Matteo, S., Haverkort, M. W., Berger, H., Bisogni, V., Cezar, J. C., Brookes, N. B., Salluzzo, M., and Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Magnetism ,02 engineering and technology ,01 natural sciences ,Sr2Cuo2Cl2 ,X-ray absorption spectra ,Condensed Matter::Materials Science ,Paramagnetism ,Condensed Matter::Superconductivity ,Magnetic properties ,0103 physical sciences ,Antiferromagnetism ,010306 general physics ,Physics ,Superconductivity ,Ray Circular-Dichroism ,Behavior ,[PHYS.PHYS.PHYS-OPTICS]Physics [physics]/Physics [physics]/Optics [physics.optics] ,Spins ,Condensed matter physics ,Magnetic circular dichroism ,Oxides ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Electronic, Optical and Magnetic Materials ,Ferromagnetism ,X-ray magnetic circular dichroism ,Phase ,Condensed Matter::Strongly Correlated Electrons ,0210 nano-technology - Abstract
International audience; 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.
- Published
- 2010
- Full Text
- View/download PDF