Extreme Fermi surface smearing in a maximally disordered concentrated solid solution

Hannah C. Robarts, Thomas E. Millichamp, Daniel A. Lagos, Jude Laverock, David Billington, Jonathan A. Duffy, Daniel O'Neill, Sean R. Giblin, Jonathan W. Taylor, Grazyna Kontrym-Sznajd, Malgorzata Samsel-Czekala, Hongbin Bei, Sai Mu, German D. Samolyuk, G. Malcolm Stocks, Stephen B. Dugdale

Research output: Contribution to journalArticle (Academic Journal)peer-review

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Abstract

We show that the Fermi surface can survive the presence of extreme compositional disorder in the equiatomic alloy Ni0.25Fe0.25Co0.25Cr0.25. Our high-resolution Compton scattering experiments reveal a Fermi surface which is smeared across a significant fraction of the Brillouin zone (up to 40% of 2π=a). The extent of this smearing and its variation on and between different sheets of the Fermi surface has been determined, and estimates of the electron mean-free-path and residual resistivity have been made by connecting this smearing with the coherence length of the quasiparticle states.
Original languageEnglish
Article number046402
Number of pages6
JournalPhysical Review Letters
Volume124
DOIs
Publication statusPublished - 30 Jan 2020

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