Coexistence of the Kondo effect and spin glass physics in Fe-doped NbS2

H Nobukane; Y Tabata; T Kurosawa; D Sakabe; S Tanda

doi:10.1088/1361-648X/ab622a

Coexistence of the Kondo effect and spin glass physics in Fe-doped NbS₂

J Phys Condens Matter. 2020 Apr 17;32(16):165803. doi: 10.1088/1361-648X/ab622a.

Authors

H Nobukane¹, Y Tabata, T Kurosawa, D Sakabe, S Tanda

Affiliation

¹ Department of Physics, Hokkaido University, Sapporo, 060-0810, Japan. Center of Education and Research for Topological Science and Technology, Hokkaido University, Sapporo, 060-8628, Japan.

PMID: 31842001
DOI: 10.1088/1361-648X/ab622a

Abstract

We report the coexistence of the Kondo effect and spin glass behavior in Fe-doped NbS₂ single crystals. The Fe _x NbS₂ shows the resistance minimum and negative magnetoresistance due to the Kondo effect, and exhibits no superconducting behavior at low temperatures. The resistance curve follows a numerical renormalization-group theory using the Kondo temperature [Formula: see text] K for x = 0.01 as evidence of Kondo effect. Scanning tunneling microscope/spectroscopy (STM/STS) revealed the presence of Fe atoms near sulfur atoms and asymmetric spectra. The magnetic susceptibility exhibits a feature of spin glass. The static critical exponents determined by the universal scaling of the nonlinear part of the susceptibility suggest a three-dimensional Heisenberg spin glass. The doped-Fe atoms in the intra- and inter-layers revealed by the x-ray result can realize the coexistence of the Kondo effect and spin glass.