Kondo-type behavior of the Ru4+ lattice in LaCu3Ru4O12

Article

关键词: ELECTRON-SPIN-RESONANCE;    TRANSITION-METAL OXIDES;    HEAVY-FERMION COMPOUNDS;    DILUTE MAGNETIC-ALLOYS;    QUANTUM CRITICALITY;    INSULATOR-TRANSITION;    LIQUID BEHAVIOR;    PEROVSKITE;    SUPERCONDUCTIVITY;    LIV2O4;   

DOI  :  10.1103/PhysRevB.93.115149

来源: SCIE

【 摘 要 】

Rare d-electron-derived heavy-fermion properties of the solid-solution series LaCu3RuxTi4-xO12 were studied for 1 <= x <= 4 by resistivity, susceptibility, specific-heat measurements, and magnetic-resonance techniques. Our results suggest the existence of a coherent Kondo lattice formed by localized Ru 4d electrons leading to strongly enhanced effective electron masses. Pure ruthenate (x = 4) is a heavy-fermionmetal characterized by a resistivity proportional to T-2 at low temperatures T. By increasing titanium substitution the coherent Fermi-liquid state is disturbed, yielding single-ion Kondo-type properties as in the paradigm 4f-based heavy-fermion compound CexLa1-xCu2.05Si2 [M. Ocko et al., Phys. Rev. B 64, 195106 (2001)]. In LaCu3RuxTi4-xO12 the heavy-fermion behavior finally breaks down upon crossing the metal-to-insulator transition close to x = 2.

【 授权许可】

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