Evidence for current-induced phase coexistence in Ca${}_2$RuO${}_4$ and its influence on magnetic order

Abstract

Combining quasistatic and time-resolved transport measurements with X-ray and neutron diffraction experiments we study the non-equilibrium states that arise in pure and in Ti substituted Ca${}_2$RuO${}_4$ under the application of current densities. Time-resolved studies of the current-induced switching find a slow conductance relaxation that can be identified with heating and a fast one that unambiguously proves an intrinsic mechanism. The current-induced phase transition leads to complex diffraction patterns. Separated Bragg reflections that can be associated with the metallic and insulating phases by their lattice parameters, indicate a real structure with phase coexistence that strongly varies with temperature and current strength. A third contribution with a $c$ lattice constant in between those of metallic and insulating phases appears upon cooling. At low current densities, this additional phase appears below $\sim$100 K and is accompanied by a suppression of the antiferromagnetic order that otherwise can coexist with current carrying states. A possible origin of the intermediate phase is discussed.

References in corpus (21)

• Mott transition in VO2 revealed by infrared spectroscopy and nano-imaging
• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Adaptive modulations of martensites
• Local Temperature Redistribution and Structural Transition During Joule-Heating-Driven Conductance Switching in VO2
• Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition
• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• From Mott insulator to ferromagnetic metal: a pressure study of Ca${}_2$RuO${}_4$
• Gigantic negative magnetoresistance in a disordered topological insulator
• High pressure diffraction studies on Ca2RuO4
• Electric Pulse Induced Resistive Switching, Electronic Phase Separation, and Possible Superconductivity in a Mott insulator
• Current-Induced Gap Suppression in the Mott Insulator Ca${}_2$RuO${}_4$
• Why stripes? Spontaneous formation of inhomogeneous structures due to elastic interactions
• Magnetic and Orbital Orders Coupled to Negative Thermal Expansion in Mott Insulators, Ca2Ru1-xMxO4 (M = Mn and Fe)
• Current-induced giant diamagnetism in the Mott insulator Ca2RuO4
• A Unique Crystal Structure of Ca${}_2$RuO${}_4$ in the Current Stabilized Semi-Metallic State
• Highly anisotropic magnon dispersion in Ca2RuO4: evidence for strong spin orbit coupling
• Nonequilibrium Orbital Transitions via Applied Electrical Current in Calcium Ruthenate
• Emergence of a metallic meta-stable phase induced by electrical current in Ca_2RuO_4
• Magnetic excitations in the metallic single-layer Ruthenates Ca(2-x)Sr(x)RuO(4) studied by inelastic neutron scattering
• Magnon dispersion in Ca2RuO4: impact of spin-orbit coupling and oxygen moments
• Diamagnetic-like response from localised heating of a paramagnetic material

Cited by in corpus (6)

• Role of local temperature in the current-driven metal-insulator transition of Ca2RuO4
• Current driven insulator-to-metal transition without Mott breakdown in Ca${}_2$RuO${}_4$
• Nature of the current-induced insulator-to-metal transition in Ca${}_2$RuO${}_4$ as revealed by transport-ARPES
• Spin-orbit coupling and crystal-field splitting in Ti-doped Ca2RuO4 studied by ellipsometry
• Challenges in extracting nonlinear current-induced phenomena in Ca2RuO4
• Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca${}_2$RuO${}_4$