Complex Quantum Phenomena in a Bilayered Calcium Ruthenate
Cao, G. · Balicas, L. · Xin, Y. · Dagotto, E. · Crow, J. E. · Nelson, C. S. · Hill, J. P.
Original · EN
Ca₃Ru₂O₇ undergoes an antiferromagnetic transition at Tₙ=56 K, followed by a Mott-like (MI) transition at TMI=48 K. This nonmetallic ground state, with a charge gap of 0.1 eV, is suppressed by a highly anisotropic metamagnetic transition that leads to a fully spin-polarized metallic state. We report the observation of Shubnikov-de Haas oscillations in the gapped state, colossal magnetoresistance in the inter-plane resistivity with a large anisotropy different from that observed in the magnetization, and non-Fermi liquid behavior in the metallic state at high magnetic fields.
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