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Vacancies, disorder-induced smearing of the electronic structure, and its implications for the superconductivity of anti-perovskite MgC0.93Ni2.85
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Ernsting, David, Billington, David, Millichamp, Thomas E., Edwards, Rebecca A., Sparkes, Hazel A., Zhigadlo, Nikolai D., Giblin, Sean R., Taylor, Jonathan W., Duffy, J. A. and Dugdale, Stephen B. (2017) Vacancies, disorder-induced smearing of the electronic structure, and its implications for the superconductivity of anti-perovskite MgC0.93Ni2.85. Scientific Reports, 7 . 10148 . doi:10.1038/s41598-017-09997-2
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Official URL: http://dx.doi.org/10.1038/s41598-017-09997-2
Abstract
The anti-perovskite superconductor MgC0.93Ni2.85 was studied using high-resolution x-ray Compton scattering combined with electronic structure calculations. Compton scattering measurements were used to determine experimentally a Fermi surface that showed good agreement with that of our supercell calculations, establishing the presence of the predicted hole and electron Fermi surface sheets. Our calculations indicate that the Fermi surface is smeared by the disorder due to the presence of vacancies on the C and Ni sites, but does not drastically change shape. The 20% reduction in the Fermi level density-of-states would lead to a significant (~70%) suppression of the superconducting T c for pair-forming electron-phonon coupling. However, we ascribe the observed much smaller T c reduction at our composition (compared to the stoichiometric compound) to the suppression of pair-breaking spin fluctuations.
| Item Type: | Journal Article | |||||||||
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| Subjects: | Q Science > QC Physics | |||||||||
| Divisions: | Faculty of Science > Physics | |||||||||
| Library of Congress Subject Headings (LCSH): | Perovskite, Perovskite -- Electric properties, Scattering (Physics) , Compton effect, Superconductivity | |||||||||
| Journal or Publication Title: | Scientific Reports | |||||||||
| Publisher: | Nature Publishing Group | |||||||||
| ISSN: | 2045-2322 | |||||||||
| Official Date: | 31 August 2017 | |||||||||
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| Volume: | 7 | |||||||||
| Article Number: | 10148 | |||||||||
| DOI: | 10.1038/s41598-017-09997-2 | |||||||||
| Status: | Peer Reviewed | |||||||||
| Publication Status: | Published | |||||||||
| Access rights to Published version: | Open Access | |||||||||
| RIOXX Funder/Project Grant: |
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