Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition

Details Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition Destruction of the Mott Insulating Ground State of Ca_2RuO_4 by a Structural Transition

1999-08-26

arxiv.org/abs/cond-mat/9908390v1

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. B (Rapid Communications)

Scientific paper

10.1103/PhysRevB.60.R8422

We report a first-order phase transition at T_M=357 K in single crystal Ca_2RuO_4, an isomorph to the superconductor Sr_2RuO_4. The discontinuous decrease in electrical resistivity signals the near destruction of the Mott insulating phase and is triggered by a structural transition from the low temperature orthorhombic to a high temperature tetragonal phase. The magnetic susceptibility, which is temperature dependent but not Curie-like decreases abruptly at TM and becomes less temperature dependent. Unlike most insulator to metal transitions, the system is not magnetically ordered in either phase, though the Mott insulator phase is antiferromagnetic below T_N=110 K.

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