Fig. 4: Temperature-dependent results of ARPES and RIXS.
From: Spin excitations and flat electronic bands in a Cr-based kagome superconductor
A Band dispersion taken with 114 eV LH polarization and horizontal slit direction at 10 K (left) and 140 K (right). White (10 K) and red (140 K) dots denote the fitted MDC positions (see SM) for the electron pocket at Γ. The arrows mark a kink in the dispersion, indicating hybridization with the FB. B EDC1 measured at the denoted position in (A) at 10 K, 140 K, and then thermally cycled back to 10 K. C Fitting details for the 10 K and 140 K EDC1 where a Lorentzian peak (orange) and a constant background (gray) are multiplied by the Fermi-Dirac (FD) function convolved with a fixed Gaussian peak of 40 meV Full-Width-Half-Maximum (FWHM mimicking the experimental resolution). Blue/red dots are the raw data points, the same as (B). Vertical dashed lines mark the fitting range. The dashed arrows denote the fitted Lorentzian peak positions. D Same as (A) but measured with LV polarization. E EDC2 as marked in (D) measured from 10 K to 90 K. (F) Fitted FB positions from EDCs after dividing the FD function convolved with a Gaussian peak with 40 meV FWHM. The dotted line marks the transition TCDW previously reported57. G Temperature-dependent RIXS. Open circles depict raw RIXS data measured with π-polarized incident X-rays at an energy of 572.5 eV and temperatures of 25, 70, and 150 K; solid lines plot the fitted elastic components. The shaded areas denote RIXS features arising from spin excitations. H RIXS spectra at 25 K (blue) and 70 K (red) after removing the elastic component. The bottom panel compares their fitted components of spin excitations. I, J Evolution of fitted parameters E0 and γ for temperatures changed across TCDW. The vertical dashed line indicates the CDW transition temperature TCDW.
