Field-tuned Collapse of an Orbital Ordered and Spin-polarized State: Colossal Magnetoresistance in Bilayered Ruthenate

Abstract

Ca3Ru2O7 with a Mott-like transition at 48 K features different in-plane anisotropies of magnetization and magnetoresistance. Applying magnetic field along the magnetic easy-axis precipitates a spin-polarized state via a first-order metamagnetic transition, but does not lead to a full suppression of the Mott state, whereas applying magnetic field along the magnetic hard axis does, causing a resistivity reduction of three orders of magnitude. The colossal magnetoresistivity is attributed to the collapse of the orbital ordered and spin-polarized state. Evidence for a density wave is also presented.

arXiv comment10 pages plus 4 figures

References in corpus (3)

• Prediction of Orbital Ordering in Single-Layered Ruthenates
• Pressure-Tuned Collapse of the Mott-Like State in Ca_{n+1}Ru_nO_{3n+1} (n=1,2): Raman Spectroscopic Studies
• Quantum Oscillations, Colossal Magnetoresistance and Magnetoelastic Interaction in Bilayered Ca3Ru2O7

Cited by in corpus (11)

• From itinerant ferromagnetism to insulating antiferromagnetism: A magnetic and transport study of single crystal SrRu1-xMnxO3
• Colossal Magnetoresistance by Avoiding a Ferromagnetic State in the Mott System Ca3Ru2O7
• Electronic Structure and Bulk Spin Valve Behavior in Ca${}_3$Ru${}_2$O${}_7$
• Orbitally-driven Behavior: Mott Transition, Quantum Oscillations and Colossal Magnetoresistance in Bilayered Ca3Ru2O7
• Field-induced Orbital Patterns in Ferromagnetic Layered Ruthenates
• Borderline magnetism in Sr4Ru3O10: Impact of dilute La and Ca doping on itinerant ferromagnetism and metamagnetism
• Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves
• Observation of oscillatory magnetoresistance periodic in 1/B and B in Ca3Ru2O7
• Observation of a pressure-induced transition from interlayer ferromagnetism to intralayer antiferromagnetism in Sr4Ru3O10
• Field-induced magnetic phase transitions and memory effect in bilayer ruthenate Ca${}_3$Ru${}_2$O${}_7$ with Fe substitution
• Spin-charge-lattice coupling near the metal-insulator transition in Ca3Ru2O7