1997/08/07 by Jaroslav Fabian, Philip B. Allen · 1 citation
Physics and Astronomy · #cond-mat.dis-nn
paper · pdf · doi:10.1103/physrevlett.79.1885
10 pages, RevTeX, 4 ps figures, Phys. Rev. Lett. (in press)
arxiv created 1997/08/07 · arxiv updated 2009/11/30
Using a realistic model, the mode Gruneisen parameters and the temperature dependent coefficient of linear thermal expansion are calculated for amorphous silicon. The resulting values of the Gruneisen parameters differ from the crystalline case in having all diversity suppressed, except for a minority of high-frequency localized and low-frequency resonance modes. The latter have very large, mostly negative Gruneisen parameters (up to -31), caused by volume driven internal strain. As a result, the values for thermal expansivity are lower than those of crystalline silicon and are sample dependent.