Short-Range Crystalline Order-Tuned Conductivity in Cr2Si2Te6 van der Waals Magnetic Crystals

Two-dimensional magnetic materials (2DMMs) are significant not only for studies on the nature of 2D long-range magnetic order but also for future spintronic devices. Of particular interest are 2DMMs where spins can be manipulated by electrical conduction. Whereas Cr2Si2Te6 exhibits magnetic order in...

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Bibliographic Details
Published in:ACS nano 2022-08, Vol.16 (8), p.13134-13143
Main Authors: Liu, Yu, Susilo, Resta A., Lee, Yongbin, Abeykoon, A. M. Milinda, Tong, Xiao, Hu, Zhixiang, Stavitski, Eli, Attenkofer, Klaus, Ke, Liqin, Chen, Bin, Petrovic, Cedomir
Format: Article
Language:English
Subjects:
Cr2Si2Te6
electronic structure
INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
insulator−metal transition
short-range crystalline order
van der Waals ferromagnet
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Summary:Two-dimensional magnetic materials (2DMMs) are significant not only for studies on the nature of 2D long-range magnetic order but also for future spintronic devices. Of particular interest are 2DMMs where spins can be manipulated by electrical conduction. Whereas Cr2Si2Te6 exhibits magnetic order in few-layer crystals, its large band gap inhibits electronic conduction. Here we show that the defect-induced short-range crystal order in Cr2Si2Te6, on the length scale below 0.6 nm, induces a substantially reduced band gap and robust semiconducting behavior down to 2 K that turns to metallic above 10 GPa. Our results will be helpful in designing conducting states in 2DMMs and call for spin-resolved measurement of the electronic structure in exfoliated ultrathin crystals.
ISSN:1936-0851
1936-086X
DOI:10.1021/acsnano.2c06080