We report the coexistence of the Kondo effect and spin glass behavior in Fe-doped NbS2 single crystals. The FexNbS2 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 TK=12.3~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.
@article{arxiv.2001.07890,
title = {Coexistence of the Kondo effect and spin glass physics in Fe-doped NbS$_2$},
author = {H. Nobukane and Y. Tabata and T. Kurosawa and D. Sakabe and S. Tanda},
journal= {arXiv preprint arXiv:2001.07890},
year = {2020}
}