Destruction of the Mott insulating ground state ofCa2RuO4by a structural transition

1999/08/26 by C. S. Alexander, G. Cao, Gang Cao +7 · 3 citations
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Magnetic and transport properties of perovskites and related materials #Physics of Superconductivity and Magnetism #cond-mat.mtrl-sci #cond-mat.str-el

paper · pdf · doi:10.1103/physrevb.60.r8422

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

arxiv created 1999/08/26 · openalex publication_date 1999/09/15 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We report a first-order phase transition at T_M=357K in single-crystal Ca₂RuO₄, an isomorph to the superconductor Sr₂RuO₄. 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 T_M 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=110K.

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