PARPIIEV, T.; SERVOL, M.; LORENC, Maciej; CHABAN, Ievgeniia; LEFORT, R.; COLLET, Eric; CAILLEAU, H.; RUELLO, P.; DARO, Nathalie; CHASTANET, Guillaume; PEZERIL, Thomas

doi:10.1063/1.5009657

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PARPIIEV, T.
Institut des Molécules et Matériaux du Mans [IMMM]

SERVOL, M.
Institut de Physique de Rennes [IPR]

LORENC, Maciej
Institut de Physique de Rennes [IPR]

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Applied Physics Letters. 2017, vol. 111, n° 17, p. 179901 (2 p.)

American Institute of Physics

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We report GHz longitudinal as well as shear acoustic phonon photoexcitation and photodetection using femtosecond laser pulses in a spin-crossover molecular crystal. From our experimental observation of time domain Brillouin scattering triggered by the photoexcitation of acoustic waves across the low-spin (LS) to high-spin (HS) thermal crossover, we reveal a link between the molecular spin state and photoexcitation of coherent GHz acoustic phonons. In particular, we experimentally evidence a non-thermal pathway for the laser excitation of GHz phonons. We also provide experimental insights into the optical and mechanical parameters evolving across the LS/HS spin crossover temperature range.< Leer menos

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Femtosecond lasers

Photoexcitations

Chemical processes

Acoustic waves

Phonons

Light scattering

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Ultrafast non-thermal laser excitation of gigahertz longitudinal and shear acoustic waves in spin-crossover molecular crystals [Fe(PM-AzA)(2)(NCS)(2)]

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