Nonlocal effects on the thermal behavior of non-crystalline solids

AUTOR(ES)

Lenzi, E. K., Astrath, N. G. C., Rossato, R., Evangelista, L. R.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2009-08

RESUMO

We argue that nonlocal effects represented by fractionary terms in the kinetic energy can be relevant to achieve a satisfactory phenomenological description of the thermal behavior of the specific heat of non-crystalline solids at very low temperature. We propose a simple model formed by the direct sum of two Hamiltonians, one of which is obtained by incorporating fractional derivatives in the kinetic energy of a conventional Hamiltonian, and the other one accounts for the presence of phonons in the system. Some experimental data are used to support the proposed description.

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