Avoided metallicity in a hole-doped Mott insulator on a triangular lattice.

Autor: Yim CM; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK. c.m.yim@sjtu.edu.cn.; Tsung Dao Lee Institute and School of Physics and Astronomy, Shanghai Jiao Tong University, 201210, Shanghai, China. c.m.yim@sjtu.edu.cn., Siemann GR; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Stavrić S; Consiglio Nazionale delle Ricerche (CNR-SPIN), Unitá di Ricerca presso Terzi c/o Universitá 'G. D'Annunzio', 66100, Chieti, Italy.; Vinča Institute of Nuclear Sciences -National Institute of the Republic of Serbia, University of Belgrade, P. O. Box 522, RS-11001, Belgrade, Serbia., Khim S; Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany., Benedičič I; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Murgatroyd PAE; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Antonelli T; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK., Watson MD; Diamond Light Source, Harwell Science and Innovation Campus, Didcot, OX11 ODE, UK., Mackenzie AP; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK.; Max Planck Institute for Chemical Physics of Solids, Nöthnitzer Straße 40, 01187, Dresden, Germany., Picozzi S; Consiglio Nazionale delle Ricerche (CNR-SPIN), Unitá di Ricerca presso Terzi c/o Universitá 'G. D'Annunzio', 66100, Chieti, Italy. silvia.picozzi@spin.cnr.it., King PDC; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK. pdk6@st-andrews.ac.uk., Wahl P; SUPA, School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife, KY16 9SS, UK. wahl@st-andrews.ac.uk.; Physikalisches Institut, Universität Bonn, Nussallee 12, 53115, Bonn, Germany. wahl@st-andrews.ac.uk.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2024 Sep 16; Vol. 15 (1), pp. 8098. Date of Electronic Publication: 2024 Sep 16.
DOI: 10.1038/s41467-024-52007-z
Abstrakt: Doping of a Mott insulator gives rise to a wide variety of exotic emergent states, from high-temperature superconductivity to charge, spin, and orbital orders. The physics underpinning their evolution is, however, poorly understood. A major challenge is the chemical complexity associated with traditional routes to doping. Here, we study the Mott insulating CrO 2 layer of the delafossite PdCrO 2 , where an intrinsic polar catastrophe provides a clean route to doping of the surface. From scanning tunnelling microscopy and angle-resolved photoemission, we find that the surface stays insulating accompanied by a short-range ordered state. From density functional theory, we demonstrate how the formation of charge disproportionation results in an insulating ground state of the surface that is disparate from the hidden Mott insulator in the bulk. We demonstrate that voltage pulses induce local modifications to this state which relax over tens of minutes, pointing to a glassy nature of the charge order.
(© 2024. The Author(s).)
Databáze: MEDLINE
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