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Enhanced superconductivity with interlayer spacing dependent T c in intercalated Weyl semimetal MoTe2

Enhanced superconductivity with interlayer spacing dependent T c in intercalated... Manipulating the strength of the interlayer coupling is an effective strategy to induce intriguing properties in layered materials. Recently, enhanced superconductivity has been reported in Weyl semimetal MoTe2 and WTe2 via ionic liquid (IL) cation intercalation. However, how the superconductivity enhancement depends on the interlayer interaction still remains elusive. Here by inserting IL cations with different sizes into MoTe2 through this strategy, we are able to tune the interlayer spacing of the intercalated MoTe2 samples and reveal the dependence of superconducting transition temperature Tc on the interlayer spacing. Our results show that Tc increases with the interlayer spacing, suggesting that the weakened interlayer coupling plays an important role in the superconductivity. Interestingly, the intercalation induced superconductivity shows a high Ginzburg–Landau anisotropy, which suggests a quasi-two-dimensional nature of the superconductivity where the adjacent superconducting layers are coupled through Josephson tunnelling. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png 2D Materials IOP Publishing

Enhanced superconductivity with interlayer spacing dependent T c in intercalated Weyl semimetal MoTe2

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Publisher
IOP Publishing
Copyright
© 2022 IOP Publishing Ltd
eISSN
2053-1583
DOI
10.1088/2053-1583/ac8ec0
Publisher site
See Article on Publisher Site

Abstract

Manipulating the strength of the interlayer coupling is an effective strategy to induce intriguing properties in layered materials. Recently, enhanced superconductivity has been reported in Weyl semimetal MoTe2 and WTe2 via ionic liquid (IL) cation intercalation. However, how the superconductivity enhancement depends on the interlayer interaction still remains elusive. Here by inserting IL cations with different sizes into MoTe2 through this strategy, we are able to tune the interlayer spacing of the intercalated MoTe2 samples and reveal the dependence of superconducting transition temperature Tc on the interlayer spacing. Our results show that Tc increases with the interlayer spacing, suggesting that the weakened interlayer coupling plays an important role in the superconductivity. Interestingly, the intercalation induced superconductivity shows a high Ginzburg–Landau anisotropy, which suggests a quasi-two-dimensional nature of the superconductivity where the adjacent superconducting layers are coupled through Josephson tunnelling.

Journal

2D MaterialsIOP Publishing

Published: Oct 1, 2022

Keywords: Weyl semimetal MoTe2 ; superconductivity; ionic liquid; intercalation; interlayer coupling; anisotropic superconductivity

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