Ultrafast non-thermal laser excitation of gigahertz longitudinal and shear acoustic waves in spin-crossover molecular crystals [Fe(PM-AzA)(2)(NCS)(2)] - Université de Rennes Access content directly
Journal Articles Applied Physics Letters Year : 2017

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

M. Servol
R. Lefort
Eric Collet
H. Cailleau
P. Ruello

Abstract

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.
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Dates and versions

hal-01681154 , version 1 (23-01-2018)

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Cite

T. Parpiiev, M. Servol, Maciej Lorenc, Ievgeniia F Chaban, R. Lefort, et al.. Ultrafast non-thermal laser excitation of gigahertz longitudinal and shear acoustic waves in spin-crossover molecular crystals [Fe(PM-AzA)(2)(NCS)(2)]. Applied Physics Letters, 2017, 111 (17), 179901 (2 p.). ⟨10.1063/1.5009657⟩. ⟨hal-01681154⟩
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