Depletion of the density of states near the Fermi energy induced by disorder and electron correlation in alloys

Abstract

We have performed high resolution photoemission study of substitutionally disordered alloys Cu-Pt, Cu-Pd, Cu-Ni, and Pd-Pt. The ratios between alloy spectra and pure metal spectra are found to have dips at the Fermi level when the residual resistivity is high and when rather strong repulsive electronelectron interaction is expected. This is in accordance with Altshuler and Aronov's model which predicts depletion of density of states at the Fermi level when both disorder and electron correlation are present.

Fermi-Dirac and Bose-Einstein Integrals and Their Applications to Resistivity in Some Magnetic Alloys, Part III

“…The main problems in the solid state of physics are the relaxation time, the density of particles, and the chemical potential, especially, those they are disorder magnetic alloys like spin glass or Kondo alloys [15]- [17].…”

Semi-Dirac and Weyl Fermions in Transition Metal Oxides

“…The partial density of states surrounding the semi-Dirac point, exhibits a depletion at the energy at which the semi-Dirac point appears [29], rather than a minimum as in the isotropic Dirac or 2D semi-Dirac cases [45]. A depletion of the density of states near the Fermi energy usually indicates a strong effect of electronic correlation or disorder [46]. The mutual interplay of these additional effects in the present semi-Dirac compound may, therefore, produce unconventional properties.…”