Chinese Physics B, Volume. 29, Issue 9, (2020)
Intercalation of van der Waals layered materials: A route towards engineering of electron correlation
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 rKW ~ 0.20a0. 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 TK 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.
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Jingjing Niu, Wenjie Zhang, Zhilin Li, Sixian Yang, Dayu Yan, Shulin Chen, Zhepeng Zhang, Yanfeng Zhang, Xinguo Ren, Peng Gao, Youguo Shi, Dapeng Yu, Xiaosong Wu. Intercalation of van der Waals layered materials: A route towards engineering of electron correlation[J]. Chinese Physics B, 2020, 29(9):
Received: Jul. 11, 2020
Accepted: --
Published Online: Apr. 29, 2021
The Author Email: Wu Xiaosong (xswu@pku.edu.cn)