Frustration-induced non-Curie-Weiss paramagnetism in La3Ir3O11: A fractional valence state iridate

Article

关键词: FERMI-LIQUID BEHAVIOR;    MAGNETIC-PROPERTIES;    RAMAN-SCATTERING;    ROOM-TEMPERATURE;    SPIN;    FERROELECTRICITY;    TRANSITION;    TRANSPORT;    GAP;   

DOI  :  10.1103/PhysRevB.100.205107

来源: SCIE

【 摘 要 】

Experimental and theoretical studies are performed on La3Ir3O11, an iridate hosting a +4.33 fractional valence state for Ir ions and a three-dimensional frustrated structure composed of edge-shared Ir2O10 dimers. These features are expected to enhance intersite hoppings and reduce magnetic moments of Ir ions. However, a spinorbit driven Mott insulating transport is observed, which is supported by our first-principles calculations. Most importantly, geometrical frustration and competing interactions result in a non-Curie-Weiss paramagnetic ground state, revealing no magnetic order down to 2 K. This unusual state is further demonstrated by a theoretical modeling process, suggesting a possible candidate for the spin-liquid state.

【 授权许可】

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