Fig. 4: Distinct evolution of CDW gap and T_c under mechanical deformation.

a Evolution of the 1 15 2/7 (blue squares) and 2/7 15 1 (orange squares) satellite intensities measured as a function of a/c. The blue (resp. orange) solid line is an inverse-sigmoid (resp. sigmoid) fit to the experimental points obtained on the 1 15 2/7 (resp. 2/7 15 1) satellite reflection. The three sketches in the top represent a (H 15 L) plane in reciprocal space. The big (resp. small) black dot is the 1 15 0 (resp. 1 15 1) Bragg reflection, and the blue (resp. orange) dots are the 1 15 ± 2/7 (resp. ± 2/7 15 1) reflections, with a color strength depending on the measured intensity in each a/c region. The error bar on the intensity is taken as \(\pm 5\sqrt{I}\) where I is the satellite intensity in each experimental condition. b Resistivity jumps \({{\Delta }}{\tilde{\rho }}_{aa}\) (blue dots) and \({{\Delta }}{\tilde{\rho }}_{cc}\) (orange dots) extracted from the experimental curves shown in Fig. 3, plotted as a function of a/c (see method in Supplementary Information). The blue (orange) solid line is an inverse-sigmoid (resp. sigmoid) fit of \({{\Delta }}{\tilde{\rho }}_{aa}\) (resp. \({{\Delta }}{\tilde{\rho }}_{cc}\)). The error bar on the resistivity jumps was estimated at ± 0.8 mΩ for all data points. c T_c computed from the resistivity curve taking the average of the local peaks found in the second derivative of \({\tilde{\rho }}_{aa}\), \({\tilde{\rho }}_{cc}\) and ρ_aa/ρ_cc as a function of a/c (see the T_c determination method in the Supplementary Information file). The error bar on T_c is ± 2 K (see procedure for the determination of T_c in the Supplementary Information file). For all three panels, the dashed gray line is the a/c value in the pristine state, and the gray filled region marks the position a/c = 1 with a width equal to the error bar (±0.8 × 10⁻³).