Issue 36, 2019

Prediction of strain-induced phonon-mediated superconductivity in monolayer YS

Abstract

The search for two-dimensional superconductors has attracted increasing interest because of their potential applications in constructing nanoscale superconducting devices. Through swarm-intelligence based CALYPSO method and the first-principles calculations, we have identified a monolayer structure for yttrium sulfide (t-YS), which is energetically and dynamically stable. The application of biaxial strain turns t-YS to a Bardeen–Cooper–Schrieffer superconductor, which mainly originates from the softening of in-plane modes of Y atoms. The superconducting critical temperature increases monotonously with strain, which reaches 6 K at a maximum strain of 10%. Calculations show that doping at 0.3 holes per unit cell based on a strain of 10% could further enhance the superconductivity to 7.3 K. Simulations have helped to propose a candidate substrate with ∼8.3% lattice mismatch to obtain superconductive t-YS experimentally. The findings will enrich two-dimensional superconductors and stimulate immediate experimental interest.

Graphical abstract: Prediction of strain-induced phonon-mediated superconductivity in monolayer YS

Supplementary files

Article information

Article type
Paper
Submitted
06 Jul 2019
Accepted
19 Aug 2019
First published
20 Aug 2019

J. Mater. Chem. C, 2019,7, 11184-11190

Prediction of strain-induced phonon-mediated superconductivity in monolayer YS

Z. Qu, S. Lin, M. Xu, J. Hao, J. Shi, W. Cui and Y. Li, J. Mater. Chem. C, 2019, 7, 11184 DOI: 10.1039/C9TC03657A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements