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 a2π). 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.
@article{arxiv.2001.11416,
title = {Extreme Fermi surface smearing in a maximally disordered concentrated solid solution},
author = {Hannah C. Robarts and Thomas E. Millichamp and Daniel A. Lagos and Jude Laverock and David Billington and Jonathan A. Duffy and Daniel O'Neill and Sean R. Giblin and Jonathan W. Taylor and Grazyna Kontrym-Sznajd and Malgorzata Samsel-Czekala and Hongbin Bei and Sai Mu and German D. Samolyuk and G. Malcolm Stocks and Stephen B. Dugdale},
journal= {arXiv preprint arXiv:2001.11416},
year = {2020}
}