Abstract
A systematic study of the low-temperature specific heat (0.1 K ≤ T ≤ 3 K) of As XSe 1-X glasses is reported. The linear specific-heat contribution which is attributed to low-energy excitations arising from two-level tunneling states shows a pronounced dependence on the average coordination number m = x + 2 with a minimum in the vicinity of the threshold of rigidity percolation m c = 2.4.
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