Ultra-fast disordering by fs-lasers: Lattice superheating prior to the entropy catastrophe
I demonstrate that the entropy change solely due to ultra-fast electronic excitation in a swiftly excited solid is minor in comparison to the entropy catastrophe value. The formation of point defects, one of two major sources of disordering, appears to be the longest of all relaxation processes in fs-laser excited solid. Thus ultra-fast excited solid can be disordered only if a lattice is superheated over the critical temperature determined by the entropy catastrophe. Disordering solely by the...[Show more]
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|Source:||Applied Physics A: Materials Science and Processing|
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