RT info:eu-repo/semantics/article
T1 Heat capacity of PbS: Isotope effects
A1 Cardona, M.
A1 Kremer, R. K.
A1 Lauck, R.
A1 Siegle, G.
A1 Romero, A. H.
A1 Serrano Gutiérrez, Jorge
AB In recent years, the availability of highly pure stable isotopes has made possible the investigation of the dependence of the physical properties of crystals, in particular, semiconductors, on their isotopic composition. Following the investigation of the specific heat (Cp,Cv) of monatomic crystals such as diamond, silicon, and germanium, similar investigations have been undertaken for the tetrahedral diatomic systems ZnO and GaN (wurtzite structure), for which the effect of the mass of the cation differs from that of the anion. In this paper, we present measurements for a semiconductor with rocksalt structure, namely, lead sulfide. Because of the large difference in the atomic mass of both constituents (MPb=207.21amu and MS=32.06amu, for the natural isotopic abundance), the effects of varying the cation and that of the anion mass are very different for this canonical semiconductor. We compare the measured temperature dependence of Cp≈Cv, and the corresponding derivatives with respect to MPb and MS, with ab initio calculations based on the lattice dynamics obtained from the local density approximation electronic band structure. Quantitative deviations between theory and experiment are attributed to the absence of spin-orbit interaction in the ABINIT program used for the electronic band structure calculations.
PB American Physical Society
SN 1098-0121
YR 2007
FD 2007
LK https://uvadoc.uva.es/handle/10324/65313
UL https://uvadoc.uva.es/handle/10324/65313
LA eng
NO Phys. Rev. B 76, 075211  (2007)
DS UVaDOC
RD 22-nov-2024