A Unique Crystal Structure of Ca${}_2$RuO${}_4$ in the Current Stabilized Semi-Metallic State

Abstract

The electric-current stabilized semi-metallic state in the quasi-two-dimensional Mott insulator Ca${}_2$RuO${}_4$ exhibits an exceptionally strong diamagnetism. Through a comprehensive study using neutron and X-ray diffraction, we show that this non-equilibrium phase assumes a crystal structure distinct from those of equilibrium metallic phases realized in the ruthenates by chemical doping, high pressure and epitaxial strain, which in turn leads to a distinct electronic band structure. Dynamical mean field theory calculations based on the crystallographically refined atomic coordinates and realistic Coulomb repulsion parameters indicate a semi-metallic state with partially gapped Fermi surface. Our neutron diffraction data show that the non-equilibrium behavior is homogeneous, with antiferromagnetic long-range order completely suppressed. These results provide a new basis for theoretical work on the origin of the unusual non-equilibrium diamagnetism in Ca${}_2$RuO${}_4$.

arXiv comment12 pages, 3 figures, 1 table

References in corpus (20)

• Observation of Floquet-Bloch states on the surface of a topological insulator
• Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
• TRIQS: A Toolbox for Research on Interacting Quantum Systems
• TRIQS/CTHYB: A Continuous-Time Quantum Monte Carlo Hybridization Expansion Solver for Quantum Impurity Problems
• The coherence-incoherence crossover and the mass-renormalization puzzles in Sr2RuO4
• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Higgs mode and its decay in a two dimensional antiferromagnet
• Transport Properties and Diamagnetism of Dirac Electrons in Bismuth
• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• From Mott insulator to ferromagnetic metal: a pressure study of Ca${}_2$RuO${}_4$
• Maximum entropy formalism for the analytic continuation of matrix-valued Green's functions
• Spin-Orbit Coupling and Electronic Correlations in Sr2RuO4
• Hallmarks of Hund's coupling in the Mott insulator Ca${}_2$RuO${}_4$
• In-situ strain-tuning of the metal-insulator-transition of Ca${}_2$RuO${}_4$ in angle-resolved photoemission experiments
• High pressure diffraction studies on Ca2RuO4
• Current-Induced Gap Suppression in the Mott Insulator Ca${}_2$RuO${}_4$
• Current-induced giant diamagnetism in the Mott insulator Ca2RuO4
• Tailoring the electronic properties of Ca${}_2$RuO${}_4$ via epitaxial strain
• Raman scattering from current-stabilized nonequilibrium phases in Ca${}_2$RuO${}_4$
• Anisotropic uniaxial pressure response of the Mott insulator Ca2RuO4

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