Kondo-effect and sign-adjustable unconventional anomalous Hall effect in rare-earth elements doped K0.6RhO2 crystals. (June 2020)

• Record Type: Journal Article
• Authors: Zhang, Bin-Bin; Han, Shuang; Lv, Yang-Yang; Yao, Shu-Hua; Zhou, Jian; Dong, Song-Tao; Chen, Y.B.
• Is Part Of: Solid state communications. Volume 313(2020)
• Publication Date: 2020-06
• Subjects: KxRhO2 -- Kondo effect -- Anomalous Hall effect; Solid state chemistry -- Periodicals; Solid state physics -- Periodicals; Chimie de l'état solide -- Périodiques; Physique de l'état solide -- Périodiques; 530.41
• DOI: 10.1016/j.ssc.2020.113896
• Languages: English
• ISSNs: 0038-1098

Abstract

Abstract: Compounds with 4 d -transition-metal elements show a series of novel quantum states, such as spin liquid, correlated topological states, which maybe come from the spin-orbit interaction in 4 d transition-metal. Here we explored the magneto-transport properties of rare-earth-element doped 4 d -transition-metal oxide-K0.6 RhO2 (RE-K0.6 RhO2 ) crystals. Centimeter-sized Sm-, Dy-, Ho-doped (doping concentration ranged from 1.6 to 3.0×10 −2 %) K0.6 RhO2 crystals were grown from high temperature solution. The temperature-dependent longitudinal resistivity ρ xx of RE-K0.6 RhO2 shows the semiconductor-behavior (d ρ /d T < 0) at low temperature (~10 K), which can be attributed Kondo effect. Magneto-resistance of RE-K0.6 RhO2 crystals is quite sensitive to amplitude and orientation of magnetic field. Remarkably, unconventional anomalous Hall effect is observed in RE-K0.6 RhO2 and its sign can be changed from positive in Sm–K0.6 RhO2 to negative in Dy-, Ho–K0.6 RhO2 . Sign change of unconventional anomalous Hall effect can be understood by phase analysis of resonance-scattering of electrical carriers by local rare-earth element, considered the internal spin structure of an impurity in Kondo effect. Our work sheds more light on the effect of rare-earth-element doping to the magneto-transport properties of compounds containing 4 d -transition-metal. Highlights: Metal-nometal transition and orientation sensitive negative magnetoresistance are found in RE-K0.6 RhO2 below 10 K. Sign-adjustable anomalous Hall effect in RE-K0.6 RhO2 was observed. It origins from the resonance-scattering of electrical carriers by local rare-earth element.