Tuning of the flat band and its impact on superconductivity in Mo5Si3−xPx

Rustem Khasanov (), Bin-Bin Ruan (), Yun-Qing Shi, Gen-Fu Chen, Hubertus Luetkens, Zhi-An Ren and Zurab Guguchia
Additional contact information
Rustem Khasanov: Paul Scherrer Institute
Bin-Bin Ruan: Chinese Academy of Sciences
Yun-Qing Shi: Chinese Academy of Sciences
Gen-Fu Chen: Chinese Academy of Sciences
Hubertus Luetkens: Paul Scherrer Institute
Zhi-An Ren: Chinese Academy of Sciences
Zurab Guguchia: Paul Scherrer Institute

Nature Communications, 2024, vol. 15, issue 1, 1-6

Abstract: Abstract The superconductivity in systems containing dispersionless (flat) bands is seemingly paradoxical, as traditional Bardeen-Cooper-Schrieffer theory requires an infinite enhancement of the carrier masses. However, the combination of flat and steep (dispersive) bands within the multiple band scenario might boost superconducting responses, potentially explaining high-temperature superconductivity in cuprates and metal hydrides. Here, we report on the magnetic penetration depths, the upper critical field, and the specific heat measurements, together with the first-principles calculations for the Mo5Si3−xPx superconducting family. The band structure features a flat band that gradually approaches the Fermi level as a function of phosphorus doping x, reaching the Fermi level at x ≃ 1.3. This leads to an abrupt change in nearly all superconducting quantities. The superfluid density data placed on the ’Uemura plot‘ results in two separated branches, thus indicating that the emergence of a flat band enhances correlations between conducting electrons.

Date: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations:

Downloads: (external link)
https://www.nature.com/articles/s41467-024-46514-2 Abstract (text/html)

Related works:
This item may be available elsewhere in EconPapers: Search for items with the same title.

Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text

Persistent link: https://EconPapers.repec.org/RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-46514-2

Ordering information: This journal article can be ordered from
https://www.nature.com/ncomms/

DOI: 10.1038/s41467-024-46514-2

Access Statistics for this article

Nature Communications is currently edited by Nathalie Le Bot, Enda Bergin and Fiona Gillespie

More articles in Nature Communications from Nature
Bibliographic data for series maintained by Sonal Shukla () and Springer Nature Abstracting and Indexing ().