Nobukane H, Tabata Y, Kurosawa T, Sakabe D, Tanda S
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.
J Phys Condens Matter. 2020 Apr 17;32(16):165803. doi: 10.1088/1361-648X/ab622a.
We report the coexistence of the Kondo effect and spin glass behavior in Fe-doped NbS single crystals. The Fe NbS 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.
我们报道了铁掺杂的铌硫（NbS）单晶中近藤效应和自旋玻璃行为的共存。Fe-NbS由于近藤效应呈现电阻最小值和负磁阻，并且在低温下不表现出超导行为。电阻曲线遵循使用近藤温度[公式：见正文]K（对于x = 0.01）的数值重整化群理论，作为近藤效应的证据。扫描隧道显微镜/能谱（STM/STS）揭示了硫原子附近存在铁原子以及不对称光谱。磁化率呈现出自旋玻璃的特征。通过磁化率非线性部分的通用标度确定的静态临界指数表明是三维海森堡自旋玻璃。X射线结果揭示的层内和层间掺杂铁原子能够实现近藤效应和自旋玻璃的共存。
