Specific heat of glasses at low temperatures

Raychaudhuri, Arup K. ; Pohl, R. O. (1982) Specific heat of glasses at low temperatures Physical Review B: Condensed Matter and Materials Physics, 25 (2). pp. 1310-1321. ISSN 0163-1829

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Official URL: http://prb.aps.org/abstract/PRB/v25/i2/p1310_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.25.1310


We have studied the specific heat of nitrate glasses (T<1 K) doped with water, lithium, and nitrite. We have found that there is a basic difference between doped crystals and doped glasses regarding the excess specific heat caused by the presence of the dopants. Dopants in glasses cause a change in the low-temperature specific heat only if the glass transition temperature TG changes upon admixing. The excess specific heat is found to be inversely proportional to TG. Similar results have been observed on silica containing sodium and on neutron-irradiated silica, for which the important parameter is the fictive temperature Tf. It is concluded that the frozen-in disorder in the glass, which is measured by TG (or Tf), is an important factor in determining the density of states of low-energy excitations which are characteristic of the amorphous state.

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