Abstract
We analyze the low- and medium-temperature specific heat of 25 samples based on eleven binary compounds, with 's ranging from less than 0.015 to 18 K. Experimentally determined "moments" of the phonon spectra (,,) are included in the analysis. Values are tabulated for , , , , , , , and . We note the following: (i) The Debye temperature is generally a bad estimate of . (ii) is governed mainly by the "electronic parameter" ; for all compounds studied. (iii) is proportional to the density of states at the Fermi level and this density of states agrees well with band-structure calculations of Jarlborg in Nb-based compounds. In V-based compounds, the observed bad correlation may reflect the presence of spin fluctuations. (iv) The values for the reduced gap range from 3.4 to 4.9 and they are correlated with .
- Received 13 May 1982
DOI:https://doi.org/10.1103/PhysRevB.27.1568
©1983 American Physical Society