Author:
Niu Jingjing,Zhang Wenjie,Li Zhilin,Yang Sixian,Yan Dayu,Chen Shulin,Zhang Zhepeng,Zhang Yanfeng,Ren Xinguo,Gao Peng,Shi Youguo,Yu Dapeng,Wu Xiaosong
Abstract
Being parent materials of two-dimensional (2D) crystals, van der Waals layered materials have received revived interest. In most 2D 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 ∼ 0.20a
0. 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 2D materials.
Subject
General Physics and Astronomy
Cited by
9 articles.
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