Magnetic-Field Tunable Intertwined Checkerboard Charge Order and Nematicity in the Surface Layer of Sr 2 RuO 4 .

Autor: Marques CA; School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Rhodes LC; School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Fittipaldi R; CNR-SPIN, UOS Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084, Italy., Granata V; Dipartimento di Fisica 'E. R. Caianiello' Universitá di Salerno, Fisciano, Salerno, I-84084, Italy., Yim CM; School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Buzio R; CNR-SPIN, Corso F.M. Perrone 24, Genova, 16152, Italy., Gerbi A; CNR-SPIN, Corso F.M. Perrone 24, Genova, 16152, Italy., Vecchione A; CNR-SPIN, UOS Salerno, Via Giovanni Paolo II 132, Fisciano, I-84084, Italy., Rost AW; School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK.; Max-Planck-Institute for Solid State Research, Heisenbergstr. 1, 70569, Stuttgart, Germany., Wahl P; School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK.
Jazyk: angličtina
Zdroj: Advanced materials (Deerfield Beach, Fla.) [Adv Mater] 2021 Aug; Vol. 33 (32), pp. e2100593. Date of Electronic Publication: 2021 Jun 27.
DOI: 10.1002/adma.202100593
Abstrakt: In strongly correlated electron materials, the electronic, spin, and charge degrees of freedom are closely intertwined. This often leads to the stabilization of emergent orders that are highly sensitive to external physical stimuli promising opportunities for technological applications. In perovskite ruthenates, this sensitivity manifests in dramatic changes of the physical properties with subtle structural details of the RuO 6 octahedra, stabilizing enigmatic correlated ground states, from a hotly debated superconducting state via electronic nematicity and metamagnetic quantum criticality to ferromagnetism. Here, it is demonstrated that the rotation of the RuO 6 octahedra in the surface layer of Sr 2 RuO 4 generates new emergent orders not observed in the bulk material. Through atomic-scale spectroscopic characterization of the low-energy electronic states, four van Hove singularities are identified in the vicinity of the Fermi energy. The singularities can be directly linked to intertwined nematic and checkerboard charge order. Tuning of one of these van Hove singularities by magnetic field is demonstrated, suggesting that the surface layer undergoes a Lifshitz transition at a magnetic field of ≈32T. The results establish the surface layer of Sr 2 RuO 4 as an exciting 2D correlated electron system and highlight the opportunities for engineering the low-energy electronic states in these systems.
(© 2021 The Authors. Advanced Materials published by Wiley-VCH GmbH.)
Databáze: MEDLINE
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