Fully filling-controlled pyrochlore ruthenates: Emergent ferromagnetic-metal state and geometrical Hall effect

Article

关键词: MAGNETIC-PROPERTIES;    R2RU2O7 R;    TRANSITION;    INSULATOR;   

DOI  :  10.1103/PhysRevB.103.L201111

来源: SCIE

【 摘 要 】

Carrier doping to the Mott insulator is essential to produce highly correlated metals with emergent properties. The pyrochlore ruthenates Pr2Ru2O7 (Ru 4d electron number n = 4) and Ca2Ru2O7 (n = 3) are a Mott insulator and a magnetic bad metal, respectively, due to the strong electron correlation. We investigate magnetotransport properties of (Pr1-xCax)(2)Ru2O7 in a whole band-filling range, 0 <= x <= 1. With increasing hole doping x, the system undergoes an insulator-metal transition. When Ca2Ru2O7 is doped with electrons (0.5 < x < 0.9), the enhanced coupling among Ru 4d spins produces a ferromagnetic-metal phase with a large anomalousHall angle up to 2%. We discuss the electronic phase transitions in (Pr1-xCax)(2)Ru2O7 in view of Hund's metal.

【 授权许可】

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