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

Solid State Communications(2020)

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Compounds with 4d-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 4d transition-metal. Here we explored the magneto-transport properties of rare-earth-element doped 4d-transition-metal oxide-K0.6RhO2 (RE-K0.6RhO2) crystals. Centimeter-sized Sm-, Dy-, Ho-doped (doping concentration ranged from 1.6 to 3.0×10−2%) K0.6RhO2 crystals were grown from high temperature solution. The temperature-dependent longitudinal resistivity ρxx of RE-K0.6RhO2 shows the semiconductor-behavior (dρ/dT < 0) at low temperature (~10 K), which can be attributed Kondo effect. Magneto-resistance of RE-K0.6RhO2 crystals is quite sensitive to amplitude and orientation of magnetic field. Remarkably, unconventional anomalous Hall effect is observed in RE-K0.6RhO2 and its sign can be changed from positive in Sm–K0.6RhO2 to negative in Dy-, Ho–K0.6RhO2. 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 4d-transition-metal.
KxRhO2,Kondo effect,Anomalous Hall effect
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