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Propagation of longitudinal acoustic phonons in ZrTe5 exposed to a quantizing magnetic field

Ehmcke, T.; Galeski, S.; Gorbunov, D.; Zherlitsyn, S.; Wosnitza, J.; Gooth, J.; Meng, T.

The compound ZrTe5 has recently been connected to a charge-density-wave (CDW) state with intriguing transport properties. Here, we investigate quantum oscillations in ultrasound measurements that microscopically originate from electron-phonon coupling and analyze how these would be affected by the presence or absence of a CDW. We calculate the phonon self-energy due to electron-phonon coupling, and from there deduce the sound-velocity renormalization and sound attenuation. We find that the theoretical predictions for a metallic Dirac model resemble the experimental data on a quantitative level for magnetic fields up to the quantum-limit regime.

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Permalink: https://www.hzdr.de/publications/Publ-33668
Publ.-Id: 33668