Unusual heavy-mass nearly ferromagnetic state with a surprisingly large Wilson ratio in the double layered ruthenates (Sr(1-x)Ca(x))(3)Ru(2)O(7)

Article

关键词: SR3RU2O7;    TRANSITION;    METAL;    INSULATOR;    PHASE;   

DOI  :  10.1103/PhysRevB.78.180407

来源: SCIE

【 摘 要 】

We report an unusual nearly ferromagnetic heavy-mass state with a surprisingly large Wilson ratio R(w) (e.g., R(w) similar to 700 for x=0.2) in double layered ruthenates (Sr(1-x)Ca(x))(3)Ru(2)O(7) with 0.08 < x < 0.4. This state does not evolve into a long-range ferromagnetically ordered state despite considerably strong ferromagnetic correlations, but it freezes into a cluster-spin glass at low temperatures. In addition, evidence of non-Fermi-liquid behavior is observed as the spin-freezing temperature of the cluster-spin glass approaches zero near x approximate to 0.1. We discuss the origin of this unique magnetic state from the Fermi-surface information probed by Hall-effect measurements.

【 授权许可】

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