Ca$_3$Ru$_2$O$_7$ undergoes an antiferromagnetic transition at $T_{ \text{ N}}=56 $K, followed by a Mott-like (MI) transition at $T_{ \text{ MI}}=48$ 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 \textit{ 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.
Categories: cond-mat.str-el cond-mat.mtrl-sci