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

Ryosuke Kurihara, Yusuke Hirose, Sumika Sano +4

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 to structural and possible exci…