Fig. 5. Heavy fermion coherence.

a Temperature dependence of spectral intensity in a 30 meV window at the Fermi level is shown along the $\overline{X}-\overline{\mathrm{\Gamma }}-\overline{X}$ momentum axis using h_ν = 112 eV photons. b Temperature dependence of ARPES data at the $\overline{\mathrm{\Gamma }}$-point reveals the emergence of a low-energy coherence peak. c Integrating spectral intensity within ±30 meV of the Fermi level shows a maximal onset slope for the coherence feature at T ~ 75K.