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Extreme Fermi Surface Smearing in a Maximally Disordered Concentrated Solid Solution.

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This summary is machine-generated.

The Fermi surface persists despite extreme disorder in NiFeCoCr alloys. High-resolution Compton scattering reveals significant smearing, providing insights into electron behavior in disordered materials.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Solid-state physics

Background:

  • Disordered alloys present challenges for understanding electronic properties.
  • The persistence of Fermi surface features in highly disordered systems is a key question.

Purpose of the Study:

  • To investigate the survival of the Fermi surface in the equiatomic NiFeCoCr alloy.
  • To quantify the effects of extreme compositional disorder on electronic band structure.

Main Methods:

  • High-resolution Compton scattering experiments.
  • Analysis of Fermi surface smearing across the Brillouin zone.
  • Estimation of electron mean free path and residual resistivity.

Main Results:

  • The Fermi surface is observed to survive extreme compositional disorder.
  • Significant smearing of the Fermi surface (up to 40% of the Brillouin zone) was detected.
  • Variations in smearing across different Fermi surface sheets were quantified.

Conclusions:

  • The Fermi surface is robust even in the presence of substantial disorder in NiFeCoCr.
  • Compton scattering provides a powerful tool to probe electronic states in disordered materials.
  • The observed smearing correlates with electron scattering and residual resistivity.