Interplay between the Kondo effect and randomness: Griffiths phase in MxTiSe2 (M=Co, Ni, and Fe) single crystals

Article

关键词: FERMI-LIQUID BEHAVIOR;    MAGNETORESISTANCE;    ALLOYS;    INTERCALATION;   

DOI  :  10.1103/PhysRevB.82.224416

来源: SCIE

【 摘 要 】

We investigate the interplay between the Kondo effect and randomness in MxTiSe2 (M=Co, Ni, and Fe) single crystals. Although the typical low-T upturn of resistivity implies the Kondo effect around the single-ion Kondo temperature T-K, positive magnetoresistance linearly proportional to the magnetic field and the power-law scaling of magnetization suggest the forbidden coexistence between Kondo effect and time-reversal symmetry breaking. This puzzling result is resolved by the Griffiths scenario-disorder-induced distribution of the Kondo temperature produces an effective Kondo temperature ((T) over bar (K)) much lower than T-K, allowing unscreened local moments above (T) over bar (K) and resulting in non-Fermi-liquid properties in MxTiSe2 below the percolation threshold (x

【 授权许可】

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