Orbitally driven behaviour: Mott transition, quantum oscillations and colossal magnetoresistance in bilayered Ca₃Ru₂O₇

Abstract

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