Colossal magnetoresistance in a Mott insulator via magnetic field-driven insulator-metal transition

Abstract

We present a new type of colossal magnetoresistance (CMR) arising from an anomalous collapse of the Mott insulating state via a modest magnetic field in a bilayer ruthenate, Ti-doped Ca${}_3$Ru${}_2$O${}_7$. Such an insulator-metal transition is accompanied by changes in both lattice and magnetic structures. Our findings have important implications because a magnetic field usually stabilizes the insulating ground state in a Mott-Hubbard system, thus calling for a deeper theoretical study to reexamine the magnetic field tuning of Mott systems with magnetic and electronic instabilities and spin-lattice-charge coupling. This study further provides a model approach to search for CMR systems other than manganites, such as Mott insulators in the vicinity of the boundary between competing phases.

arXiv comment10 pages, 4 figures

References in corpus (16)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Mott transition and suppression of orbital fluctuations in orthorhombic 3$d^1$ perovskites
• Universality and Critical Behavior at the Mott transition
• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Competing Ferromagnetic and Charge-Ordered States in Models for Manganites: the Origin of the CMR Effect
• Nature of the Mott transition in Ca2RuO4
• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• Orbital Dependent Phase Control in Ca2-xSrxRuO4
• Subband filling and Mott transition in Ca_{2-x}Sr_xRuO_4
• Electric Pulse Induced Resistive Switching, Electronic Phase Separation, and Possible Superconductivity in a Mott insulator
• Spin-valve effect and magnetoresistivity in single crystalline Ca3Ru2O7
• Effect of a magnetic field on Mott-Hubbard systems
• Magnetic-Field-Induced Mott Transition in a Quasi-Two-Dimensional Organic Conductor
• Colossal Magnetoresistance by Avoiding a Ferromagnetic State in the Mott System Ca3Ru2O7
• Unveiling First Order CMR Transitions in the Two-Orbital Model for Manganites
• Electronic Structure and Bulk Spin Valve Behavior in Ca${}_3$Ru${}_2$O${}_7$

Cited by in corpus (11)

• Magnetoelectric multipoles in metals
• Critical Behavior in Doping-Driven Metal$-$Insulator Transition on Single-Crystalline Organic Mott-FET
• Holographic DC Conductivity for Backreacted Nonlinear Electrodynamics with Momentum Dissipation
• Enhancement of magnetodielectric coupling in 6H-perovskites Ba3RRu2O9 for heavier rare earth cations (R=Ho,Tb)
• Resonant Inelastic X-ray Scattering Study of Ca${}_3$Ru${}_2$O${}_7$
• In situ control of diamagnetism by electric current in Ca${}_3$(Ru${}_{1-x}$Ti${}_x$)${}_2$O${}_7$
• Field-induced magnetic phase transitions and memory effect in bilayer ruthenate Ca${}_3$Ru${}_2$O${}_7$ with Fe substitution
• Emergence of Competing Stripe Phase near the Mott Transition in Ti-doped Bilayer Calcium Ruthenates
• Role of orbital off-diagonal spin and charge condensates in a three orbital model for $\mathrm{C}{\mathrm{a}}_2\mathrm{Ru}{\mathrm{O}}_4$ -- Coulomb renormalized spin-orbit coupling, orbital moment, and tunable magnetic order
• Universal size-dependent nonlinear charge transport in single crystals of the Mott insulator Ca${}_2$RuO${}_4$
• Magnetoresistivity in the Antiferromagnetic Hubbard Model