Orbitally-driven Behavior: Mott Transition, Quantum Oscillations and Colossal Magnetoresistance in Bilayered Ca3Ru2O7

Abstract

We report recent transport and thermodynamic experiments over a wide range of temperatures for the Mott-like system Ca3Ru2O7 at high magnetic fields, B, up to 30 T. This work reveals a rich and highly anisotropic phase diagram, where applying B along the a-, b-, and c-axis leads to vastly different behavior. A fully spin-polarized state via a first order metamagnetic transition is obtained for B||a, and colossal magnetoresistance is seen for B||b, and quantum oscillations in the resistivity are observed for B||c, respectively. The interplay of the lattice, orbital and spin degrees of freedom are believed to give rise to this strongly anisotropic behavior.

26 pages and 8 figures

References in corpus (6)

• Orbital Dependent Phase Control in Ca2-xSrxRuO4
• Electronic Structure and Fermiology of Sr${}_3$Ru${}_2$O${}_7$
• 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
• Field-tuned Collapse of an Orbital Ordered and Spin-polarized State: Colossal Magnetoresistance in Bilayered Ruthenate

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• Ca3(Ru1-xCrx)2O7: A new paradigm for spin valves
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• Observation of a pressure-induced transition from interlayer ferromagnetism to intralayer antiferromagnetism in Sr4Ru3O10
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• Symmetry breaking and unconventional charge ordering in single crystal Na${}_{2.7}$Ru${}_4$O${}_9$
• Magnetic anisotropy and geometrical frustration in the Ising spin-chain system Sr5Rh4O12
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• Exotic magnetic anisotropy near digitized dimensional Mott boundary
• A simplified method characterizing magnetic ordering modulated photo-thermoelectric response in noncentrosymmetric semimetal Ca3Ru2O7