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Strong-coupling superconductivity induced by calcium intercalation in bilayer transition-metal dichalcogenides |
R. Szcze¸śniak, A. P. Durajski( ), M. W. Jarosik |
| Institute of Physics, Cze¸stochowa University of Technology, Ave. Armii Krajowej 19, 42-200 Cze¸stochowa, Poland |
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Abstract We theoretically investigate the possibility of achieving a superconducting state in transition-metal dichalcogenide bilayers through intercalation, a process previously and widely used to achieve metallization and superconducting states in novel superconductors. For the Ca-intercalated bilayers MoS2 and WS2, we find that the superconducting state is characterized by an electron–phonon coupling constant larger than 1.0 and a superconducting critical temperature of 13.3 and 9.3 K, respectively. These results are superior to other predicted or experimentally observed two-dimensional conventional superconductors and suggest that the investigated materials may be good candidates for nanoscale superconductors. More interestingly, we proved that the obtained thermodynamic properties go beyond the predictions of the mean-field Bardeen–Cooper–Schrieffer approximation and that the calculations conducted within the framework of the strong-coupling Eliashberg theory should be treated as those that yield quantitative results.
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| Keywords
2D superconductivity
effect of intercalation
transition-metal dichalcogenides
thermodynamic properties
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Corresponding Author(s):
A. P. Durajski
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Issue Date: 30 October 2017
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