Intercalation of van der Waals layered materials:A route towards engineering of electron correlation

【摘要】 Being parent materials of two-dimensional（2 D） crystals,van der Waals layered materials have received revived interest.In most 2 D materials,the interaction between electrons is negligible.Introducing the interaction can give rise to a variety of exotic properties.Here,via intercalating a van der Waals layered compound VS₂,we find evidence for electron correlation by extensive magnetic,thermal,electrical,and thermoelectric characterizations.The low temperature Sommerfeld coefficient is 64 mJ·K^-2·mol^-1 and the Kadowaki-Woods ratio r_KW～0.20 a₀.Both supports an enhancement of the electron correlation.The temperature dependences of the resistivity and thermopower indicate an important role played by the Kondo effect.The Kondo temperature T_K is estimated to be around 8 K.Our results suggest intercalation as a potential means to engineer the electron correlation in van der Waals materials,as well as 2 D materials.更多还原

【Abstract】 Being parent materials of two-dimensional（2 D） crystals,van der Waals layered materials have received revived interest.In most 2 D materials,the interaction between electrons is negligible.Introducing the interaction can give rise to a variety of exotic properties.Here,via intercalating a van der Waals layered compound VS₂,we find evidence for electron correlation by extensive magnetic,thermal,electrical,and thermoelectric characterizations.The low temperature Sommerfeld coefficient is 64 mJ·K^-2·mol^-1 and the Kadowaki-Woods ratio r_KW～0.20 a₀.Both supports an enhancement of the electron correlation.The temperature dependences of the resistivity and thermopower indicate an important role played by the Kondo effect.The Kondo temperature T_K is estimated to be around 8 K.Our results suggest intercalation as a potential means to engineer the electron correlation in van der Waals materials,as well as 2 D materials.更多还原