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Paper Details

A Theoretical Study of Ultrafast Quasi-Particle Relaxation Time in Normal Metals and Heavy- Fermion Materials

D. Prasad*, P.C. Sharma**, and L.K. Mishra

Journal Title:Journal of Chemical, Biological and physical sciences

Ultrafast quasi-particle relaxation dynamics for normal metal and heavyfermion material have been studied. Using the theoretical model developed by K. H. Ahn et. al. (2004) which is based on Two- Temperature model (TTM) and coupled Boltzmann equation, an evaluation of relaxation time ? for LuAgCu4 metal and heavy-fermion YbAgCu4 have been performed. For normal metal at low temperature electron distribution gives temperature independent relaxation time where as TTM predicts ?~ T-3 behavior. For heavy-fermion material with peak DOS at EF, relaxation time shows ? ~ T-1 at low T. Our theoretically evaluated results are in good agreement with the experimental data and also with other theoretical workers.