Suppression of atomic displacive excitation in photo-induced A${}_{1g}$ phonon mode of bismuth unveiled by low-temperature time-resolved x-ray diffraction

Abstract

An ultrafast atomic motion of a photo-induced coherent phonon of bismuth at low temperatures was directly observed with time-resolved x-ray diffraction. A cryostat with a window that is transparent to both optical lasers and x-rays enabled versatile diffraction measurements in a wide temperature range including below 10 K. It is found that an atomic displacement in a fully symmetric A${}_{1g}$ phonon mode is suppressed at low temperatures. This result indicates the displacive excitation process is suppressed in the phonon generation with decreasing temperature.

References in corpus (2)

• Nonlinear lattice dynamics as a basis for enhanced superconductivity in YBa2Cu3O6.5
• Characterization of photoinduced normal state through charge density wave in superconducting YBa${}_2$Cu${}_3$O${}_{6.67}$

Cited by in corpus (1)

• A simple method to find temporal overlap between THz and X-ray pulses using X-ray-induced carrier dynamics in semiconductors