From Mott insulator to ferromagnetic metal: a pressure study of Ca${}_2$RuO${}_4$

Abstract

We show that the pressure-temperature phase diagram of the Mott insulator Ca${}_2$RuO${}_4$ features a metal-insulator transition at 0.5GPa: at 300K from paramagnetic insulator to paramagnetic quasi-two-dimensional metal; at $T\le$ 12K from antiferromagnetic insulator to ferromagnetic, highly anisotropic, three-dimensional metal. % We compare the metallic state to that of the structurally related p-wave superconductor Sr${}_2$RuO${}_4$, and discuss the importance of structural distortions, which are expected to couple strongly to pressure.

4 pages, 4figures

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• Structural and magnetic aspects of the metal insulator transition in Ca${}_{2-x}$Sr${}_x$RuO${}_4$
• Competitions in layered ruthenates: ferro- vs. antiferromagnetism and triplet vs. singlet pairing
• Magnetic Phase Diagram of Ca2-xSrxRuO4 Governed by Structural Distortions
• Interplay of Mott Transition and Ferromagnetism in the Orbitally Degenerate Hubbard Model
• Prediction of Orbital Ordering in Single-Layered Ruthenates
• Filling Control of the Mott Insulator Ca2RuO4

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