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Prediction of superconductivity in a series of tetragonal transition metal dichalcogenides

Materials Horizons, ISSN: 2051-6355, Vol: 11, Issue: 11, Page: 2694-2700
2024
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Ocean University of China Reports Findings in Materials Science (Prediction of superconductivity in a series of tetragonal transition metal dichalcogenides)

2024 APR 01 (NewsRx) -- By a News Reporter-Staff News Editor at Electronics Daily -- New research on Science - Materials Science is the subject

Article Description

Transition metal dichalcogenides (TMDCs) represent a well-known material family with diverse structural phases and rich electronic properties; they are thus an ideal platform for studying the emergence and exotic phenomenon of superconductivity (SC). Herein, we propose the existence of tetragonal TMDCs with a distorted Lieb (dLieb) lattice structure and the stabilized transition metal disulfides (MS), including dLieb-ZrS, dLieb-NbS, dLieb-MnS, dLieb-FeS, dLieb-ReS, and dLieb-OsS. Except for semiconducting dLieb-ZrS and magnetic dLieb-MnS, the rest of metallic dLieb-MS was found to exhibit intrinsic SC with the transition temperature (T) ranging from ∼5.4 to ∼13.0 K. The T of dLieb-ReS and dLieb-OsS exceeded 10 K and was higher than that of the intrinsic SC in the known metallic TMDCs, which is attributed to the significant phonon-softening enhanced electron-phonon coupling strength. Different from the Ising spin-orbit coupling (SOC) effect in existing non-centrosymmetric TMDCs, the non-magnetic dLieb-MS monolayers exhibit the Dresselhaus SOC effect, which is featured by in-plane spin orientations and will give rise to the topological SC under proper conditions. In addition to enriching the structural phases of TMDCs, our work predicts a series of SC candidates with high intrinsic T and topological non-triviality used for fault-tolerant quantum computation.

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