Abstract
Since the discovery of high-Tc superconductivity in La2–xBaxCuO4–y, and related perovskite systems1–5, the magnetic properties of the parent compound La2CuO4–y have been of great interest, particularly with respect to the possibility that the mechanism for superconductivity in these oxide superconductors may involve antiferromagnetism6–8. In undoped La2CuO4–y, the magnetic susceptibility shows a cusp and antiferromagnetic ordering has been confirmed by neutron scattering9, nuclear magnetic resonance10,11 and Mössbauer spectroscopy12. Yet the magnetic properties have not been fully reconciled with the proposed spin structure10,13. Here we report static magnetic susceptibility measurements on a single crystal of undoped La2CuO4–y that reveal the existence of a new magnetic state. In low magnetic field, we observed a magnetic 'glassy' behaviour below the Néel temperature TN (∼270 K), indicating that the ground state of this material is not a simple antiferromagnetic state. These observations may have some relevance to the origin of the high-Tc superconductivity.
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References
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Tokumoto, M., Nishihara, Y., Oka, K. et al. A magnetic 'glassy' state in La2CuO4–y. Nature 330, 48–49 (1987). https://doi.org/10.1038/330048a0
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DOI: https://doi.org/10.1038/330048a0
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