2010/12/15 by Minoru Sasaki, Akimasa Ohnishi, Akira Ohnishi +7 · 1 citation
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Electrical resistivity and conductivity #Iron-based superconductors research #Kondo effect #Magnetic and transport properties of perovskites and related materials #Mathematics #Percolation (cognitive psychology) #Phase (matter) #Physics #Quantum mechanics #Randomness #Rare-earth and actinide compounds #Statistics #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.82.224416
published as Phys. Rev. B 82, 224416 (2010)
openalex publication_date 2010/12/15 · arxiv created 2011/05/04 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 TK, 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 (TK) much lower than TK, allowing unscreened local moments above TK and resulting in non-Fermi-liquid properties in MxTiSe2 below the percolation threshold (x<xc).