Kondo Effect — Magnetic Impurity Resonance & Electron Screening

J (coupling): 0.20 ε_d (level): -3.0D T/T_K: 0.10 Cool Down Reset

T_K = — Γ (hybridization) = — Kondo resonance height = — Phase shift δ(0) = —

The Kondo effect: a magnetic impurity with spin J in a metal couples antiferromagnetically to conduction electrons. Below the Kondo temperature T_K = D·exp(-1/(2ρJ)), many-body screening forms a singlet state, producing a sharp Abrikosov-Suhl resonance at the Fermi level (ω=0). The resonance width ~ T_K, and the phase shift δ(ω=0) = π/2 (Friedel sum rule).