Fig. 3: Pseudogap-like suppression in ARPES spectra.

a ARPES energy-momentum intensity map (EMIM) for the x = 0.1 sample at T ~ 14 K along ΓL direction. b Symmetrized EDCs as a function of temperature at the L point marked by the black dashed lines in a and d. The positive-energy parts of the spectra are shown by dotted lines. c Comparison of the zoomed-in views close to μ of the leading edges of the EDCs from the x = 0.1 sample and a polycrystalline gold sample at 14, 73, and 103 K. The leading edges of the EDCs of the Pt-doped sample are shifted toward negative energy with respect to that of gold at 14 and 73 K. This shift, and hence the energy gap, is absent at 103 K. d, e are respectively the same as a and b but for x = 0. f Temperature evolution of the filling up parameter \(L(T)\equiv 1-\frac{I(T,0)}{I(T,{\omega }_{\text{peak}})}\) for the x = 0.1 sample. The black arrow points to the anticipated value of T*, obtained from the extrapolation of L to zero. The red and blue arrows in b and e correspond to the CDW replica bands due to zone folding. Black arrows correspond to the spectral features associated with the conduction bands at the L point.