Colossal Magnetoresistance by Avoiding a Ferromagnetic State in the Mott System Ca3Ru2O7

Abstract

Transport and magnetic studies of Ca3Ru2O7 for temperatures ranging from 0.4 K to 56 K and magnetic fields, B, up to 45 T leads to strikingly different behavior when the field is applied along the different crystal axes. A ferromagnetic (FM) state with full spin polarization is achieved for B||a-axis, but colossal magnetoresistance is realized only for B||b-axis. For B||c-axis, Shubnikov-de Haas oscillations are observed and followed by a less resistive state than for B||a. Hence, in contrast to standard colossal magnetoresistive materials, the FM phase is the least favorable for electron hopping. These properties together with highly unusual spin-charge-lattice coupling near the Mott transition (48 K) are driven by the orbital degrees of freedom.

15 pages including 3 figures

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Cited by in corpus (25)

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• Electronic Structure and Bulk Spin Valve Behavior in Ca${}_3$Ru${}_2$O${}_7$
• Colossal magnetoresistance in a Mott insulator via magnetic field-driven insulator-metal transition
• Severe Fermi Surface Reconstruction at a Metamagnetic-Transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$ (for $0.2\le x\le 0.5$)
• Field-induced Orbital Patterns in Ferromagnetic Layered Ruthenates
• Cooperative Interactions Govern the Fermiology of the Polar Metal Ca${}_3$Ru${}_2$O${}_7$
• Half metallic ferromagnetism in tri-layered perovskites Sr${}_4$T${}_3$O${}_{10}$ (T=Co, Rh)
• Borderline magnetism in Sr4Ru3O10: Impact of dilute La and Ca doping on itinerant ferromagnetism and metamagnetism
• Specific Heat of (Ca1-xSrx)3Ru2O7 Single Crystals
• Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves
• Thermodynamic and electron-transport properties of Ca3Ru2O7 from first-principles phonon calculations and Boltzmann transport theory
• Resonant Inelastic X-ray Scattering Study of Ca${}_3$Ru${}_2$O${}_7$
• Magnetic Multipoles in a Ruthenate Ca3Ru2O7
• Observation of a pressure-induced transition from interlayer ferromagnetism to intralayer antiferromagnetism in Sr4Ru3O10
• Observation of oscillatory magnetoresistance periodic in 1/B and B in Ca3Ru2O7
• Spin-charge-lattice coupling near the metal-insulator transition in Ca3Ru2O7
• Emergent exchange-driven giant magnetoelastic coupling in a correlated itinerant ferromagnet
• Nonlinear Transport Signatures of Hidden Symmetry Breaking in a Weyl Altermagnet
• Photoinduced phase switching at a Mott insulator-to-metal transition
• 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
• Anomalous orbital moment in the ferromagnetic phase of the Sr4Ru3O10
• The power of flexible lattice in Ca3Ru2O7: Exquisite control of the electrical transport via anisotropic magnetostriction
• Probing Hidden Symmetry and Altermagnetism with Sub-Picometer Sensitivity via Nonlinear Transport