![]() Electrons, initially excited to a high effective temperature Te by the pump pulse, relax on the time scale τf by thermalizing with only a set of strongly coupled phonons (SCPs) at temperature Ts via electron–phonon coupling gep. e Schematic of microscopic origin of the relaxation processes of LiOsO3. Black lines in a–d are linear fits of the data while error bars derive from the χ² of the bi-exponential fits. However, the decay constants of a fast and b slow relaxation processes display a lack of fluence dependence that is indicative of intra-band photo-carrier relaxation and therefore suggests a selective electron–phonon coupling in LiOsO3. Both the amplitudes of a fast and b slow relaxation processes display a linear dependence that is characteristic of the linear response regime. ![]() ![]() a–d Fluence dependence of the transient reflectivity of LiOsO3 at T = 80 K as captured by the parameters of the bi-exponential model. Microscopic origin of the two relaxations in LiOsO3.
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