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

Abstract

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 \overline{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 (\overline{T}_{K}) much lower than \overline{T}_{K}, allowing unscreened local moments above \overline{T}_{K} and resulting in non-Fermi liquid properties in MxTiSe2 below the percolation threshold (x<xc).

References in corpus (3)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• Disorder-Driven Non-Fermi Liquid Behavior of Correlated Electrons
• Emergence of Fermi pockets in an excitonic CDW melted novel superconductor

Cited by in corpus (5)

• High magnetic field induced crossover from the Kondo to Fermi liquid behavior in 1$T$-VTe${}_2$ single crystals
• The crystal structure, chemical bonding and magnetic properties of the intercalation compounds Cr${}_x$ZrTe${}_2$ ($x$ = 0-0.3)
• Drastic suppression of CDW (charge density wave) by Pd addition in TiSe2
• Competition between Kondo and RKKY correlations in the presence of strong randomness
• Quantum Griffiths singularity in the stoichiometric heavy-fermion system CeRh${}_4$Al${}_{15}$