Physics – Condensed Matter – Materials Science
Scientific paper
2007-05-12
Physics
Condensed Matter
Materials Science
17 pages including 10 Figs
Scientific paper
10.1103/PhysRevB.76.075211
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 ($C_p$, $C_v$) 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 article we present measurements for a semiconductor with rock salt structure, namely lead sulfide. Because of the large difference in the atomic mass of both constituents ($M_{\rm Pb}$= 207.21 and ($M_{\rm S}$=32.06 a.m.u., 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 $C_p \approx C_v$, and the corresponding derivatives with respect to ($M_{\rm Pb}$ and $M_{\rm S}$), with \textit{\textit{ab initio}} calculations based on the lattice dynamics obtained from the local density approximation (LDA) 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.
Cardona Manuel
Kremer Reinhard K.
Lauck Ronald
Romero Aldo H.
Serrano Javier
No associations
LandOfFree
Heat Capacity of PbS: Isotope Effects does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Heat Capacity of PbS: Isotope Effects, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Heat Capacity of PbS: Isotope Effects will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-457884