From Mott insulator to ferromagnetic metal: a pressure study of Ca2RuO4
Fumihiko Nakamura, Tatsuo Goko, Masakazu Ito, Toshizo Fujita, Satoru Nakatsuji, Hideto Fukazawa, Yoshiteru Maeno, Patricia Alireza, Dominic Forsythe, Stephen R. Julian
Abstract
We show that the pressure-temperature phase diagram of the Mott insulator Ca2RuO4 features a metal-insulator transition at 0.5GPa: at 300K from paramagnetic insulator to paramagnetic quasi-two-dimensional metal; at T ≤ 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 Sr2RuO4, and discuss the importance of structural distortions, which are expected to couple strongly to pressure.
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