Fig. 4: Magnetic field dependence of the phonon spectra at the wave vector of the 3D charge-density-wave order.
From: Hybridization of lattice and charge order excitations in a superconducting cuprate

Magnetic field dependence of the experimental χ″(Q, ω) from inelastic x-ray scattering spectra recorded at the reciprocal space wave vector Q = \({{{{\bf{Q}}}}}_{{{{\bf{3D}}}}}^{{{{\bf{long}}}}}\) = (0 1.685 1) at a 295 (150) K, b 65 K, c 47 K and d 30 K. The open symbols correspond to the data measured under zero field and the color-filled symbols correspond to those taken under 7 T. The intensities have been normalized to the intensity of the  ~11 meV peak. The error bars correspond to the statistical error.