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Article Dans Une Revue Nature Physics Année : 2020

Hidden magnetism at the pseudogap critical point of a cuprate superconductor

Jérôme Debray

Résumé

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.

Dates et versions

hal-03024412 , version 1 (25-11-2020)

Identifiants

Citer

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, 2020, 16, pp.1064-1068. ⟨10.1038/s41567-020-0950-5⟩. ⟨hal-03024412⟩
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