Emergence of a metallic meta-stable phase induced by electrical current in Ca_2RuO_4

Abstract

A comprehensive study of the behavior of the Mott insulator Ca_2RuO_4 under electrical current drive is performed by combining two experimental probes: the macroscopic electrical transport and the microscopic X-Ray diffraction. The resistivity, rho, vs electric current density, J, and temperature, T , rho(J,T), resistivity map is drawn. In particular, the meta-stable state, induced between the insulating and the metallic thermodynamic states by current biasing Ca_2RuO_4 single crystals, is investigated. Such an analysis, combined with the study of the resulting RuO_6 octahedra energy levels, reveals that a metallic crystal phase emerges in the meta-stable regime. The peculiar properties of such a phase, coexisting with the well-established orthorhombic insulating and tetragonal metallic phases, allow to explain some of the unconventional and puzzling behaviors observed in the experiments, as a negative differential resistivity.

References in corpus (2)

• Orbitally selective breakdown of Fermi liquid quasiparticles in Ca${}_{1.8}$Sr${}_{0.2}$RuO${}_4$
• In situ control of diamagnetism by electric current in Ca${}_3$(Ru${}_{1-x}$Ti${}_x$)${}_2$O${}_7$

Cited by in corpus (10)

• Orbital-selective altermagnetism and correlation-enhanced spin-splitting in transition metal oxides
• Evidence for current-induced phase coexistence in Ca${}_2$RuO${}_4$ and its influence on magnetic order
• Current driven insulator-to-metal transition without Mott breakdown in Ca${}_2$RuO${}_4$
• Pseudospin-lattice coupling and electric control of the square-lattice iridate Sr2IrO4
• Pattern Formation by Electric-field Quench in Mott Crystal
• Towards Electrical-Current Control of Quantum States in Spin-Orbit-Coupled Matter
• Diamagnetic-like response from localised heating of a paramagnetic material
• Mott-Insulator Ca2RuO4 under a static external electric field
• Emerging new phases in correlated Mott insulator Ca2RuO4
• Challenges in extracting nonlinear current-induced phenomena in Ca2RuO4