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Hidden magnetism at the pseudogap critical point of a cuprate superconductor

Abstract : The mysterious pseudogap phase of cuprate superconductors ends at a critical hole doping level p* but the nature of the ground state below p* is still debated. Here, we show that the genuine nature of the magnetic ground state in La2-xSrxCuO4 is hidden by competing effects from superconductivity: applying intense magnetic fields to quench superconductivity, we uncover the presence of glassy antiferromagnetic order up to the pseudogap boundary p* ~ 0.19, and not above. There is thus a quantum phase transition at p*, which is likely to underlie highfield observations of a fundamental change in electronic properties across p*. Furthermore, the continuous presence of quasi-static moments from the insulator up to p* suggests that the physics of the doped Mott insulator is relevant through the entire pseudogap regime and might be more fundamentally driving the transition at p* than just spin or charge ordering.
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Contributor : Marc-Henri Julien <>
Submitted on : Wednesday, November 25, 2020 - 6:20:14 PM
Last modification on : Wednesday, January 13, 2021 - 9:36:50 AM

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Mehdi Frachet, Igor Vinograd, Rui Zhou, Siham Benhabib, Shangfei Wu, et al.. Hidden magnetism at the pseudogap critical point of a cuprate superconductor. Nature Physics, Nature Publishing Group, 2020, 16, pp.1064-1068. ⟨10.1038/s41567-020-0950-5⟩. ⟨hal-03024412⟩



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