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We performed ultrasonic measurements on (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$to investigate the contribution of acoustic phonons at the zone center tostructural and possible excitonic transitions. The transverse elastic constant$C_{55}$ with irreducible representation $B_\mathrm{2g}$ exhibits softeningover 90\% above a transition temperature of $T_\mathrm{s} = 280$ K, indicatingthe soft mode of corresponding TA phonons. Our analysis based on the quadrupoleresponse indicates that the electron-phonon interaction contributes to theexcitonic transition in addition to the hybridization between the conductionand valence bands if the excitonic transition is realized.

journal of the physical society of japan

Elastic Soft Mode and Electric Quadrupole Response in Excitonic  Insulator Candidate (Ta$_{0.952}$V$_{0.048}$)$_2$NiSe$_5$: Contribution of  Electron-Phonon Interaction