High anisotropy in electrical and thermal conductivity through the design of aerogel-like superlattice (NaOH)0.5NbSe2

Ruijin Sun (), Jun Deng, Xiaowei Wu, Munan Hao, Ke Ma, Yuxin Ma, Changchun Zhao, Dezhong Meng, Xiaoyu Ji, Yiyang Ding, Yu Pang, Xin Qian, Ronggui Yang, Guodong Li, Zhilin Li, Linjie Dai, Tianping Ying, Huaizhou Zhao, Shixuan Du, Gang Li, Shifeng Jin () and Xiaolong Chen ()
Additional contact information
Ruijin Sun: China University of Geosciences, Beijing (CUGB)
Jun Deng: Chinese Academy of Science
Xiaowei Wu: Chinese Academy of Science
Munan Hao: Chinese Academy of Science
Ke Ma: Chinese Academy of Science
Yuxin Ma: Chinese Academy of Science
Changchun Zhao: China University of Geosciences, Beijing (CUGB)
Dezhong Meng: China University of Geosciences, Beijing (CUGB)
Xiaoyu Ji: Chinese Academy of Science
Yiyang Ding: Imperial College London
Yu Pang: Huazhong University of Science and Technology
Xin Qian: Huazhong University of Science and Technology
Ronggui Yang: Huazhong University of Science and Technology
Guodong Li: Chinese Academy of Science
Zhilin Li: Chinese Academy of Science
Linjie Dai: Cavendish Laboratory, 19 JJ Thomson Avenue
Tianping Ying: Chinese Academy of Science
Huaizhou Zhao: Chinese Academy of Science
Shixuan Du: Chinese Academy of Science
Gang Li: Chinese Academy of Science
Shifeng Jin: Chinese Academy of Science
Xiaolong Chen: Chinese Academy of Science

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Interlayer decoupling plays an essential role in realizing unprecedented properties in atomically thin materials, but it remains relatively unexplored in the bulk. It is unclear how to realize a large crystal that behaves as its monolayer counterpart by artificial manipulation. Here, we construct a superlattice consisting of alternating layers of NbSe2 and highly porous hydroxide, as a proof of principle for realizing interlayer decoupling in bulk materials. In (NaOH)0.5NbSe2, the electric decoupling is manifested by an ideal 1D insulating state along the interlayer direction. Vibration decoupling is demonstrated through the absence of interlayer models in the Raman spectrum, dominant local modes in heat capacity, low interlayer coupling energy and out-of-plane thermal conductivity (0.28 W/mK at RT) that are reduced to a few percent of NbSe2’s. Consequently, a drastic enhancement of CDW transition temperature (>110 K) and Pauling-breaking 2D superconductivity is observed, suggesting that the bulk crystal behaves similarly to an exfoliated NbSe2 monolayer. Our findings provide a route to achieve intrinsic 2D properties on a large-scale without exfoliation.

Date: 2023
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DOI: 10.1038/s41467-023-42510-0

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