Fig. 3.

Temperature dependence of $\alpha$-band Ce 4$f$ states for the CeCo${\mathrm{I}\mathrm{n}}_5$ (001) cleaved surface. (A and B) DMFT $A\left(k,\omega \right)$ spectral image at 10 K for cut 1 in Fig. 2 through both $\alpha$ and $\beta$ $E_{\text{F}}$ crossings without (A) and with (B) a Fermi–Dirac thermal distribution cutoff. (C) Experimental $\alpha$- and $\beta$-band crossings at 8 K for a similar momentum cut. (D and E) ARPES $T$ dependence of the $\alpha$-band $E_{\text{F}}$ crossing including selected spectral images (D) and $k_{\text{F}}$ line spectra (E). (F–H) DMFT $T$ dependence of the $\alpha$-band dispersion (F) and quantitative analysis of the Fermi velocity (G) and Fermi momentum (H).