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Article overview
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Thermal Expansion of Germanium Isotopes at Low Temperature | R. Colella
; B. Reinhart
; E. Alp
; G. Haller
; | Date: |
8 Oct 2009 | Abstract: | The focus of this paper is the vanishing of the thermal expansion in certain
diamond-like semiconductors. In silicon becomes zero at T = 122. K. In
germanium the situation is less clear. Previous investigations show that in
natural germanium a zero in is reported at 15.5 K and that a second zero for T
> 30 K is not observed. This paper reports on data taken on four monoisotopic
Ge crystals. All plots of lattice parameter vs temperature shows a minimum
between 40 and 50 K. The minimum is very deep for 70Ge, which also shows
anomalous behaviour for the thermal expansion alpha. The data are discussed
with ab initio theoretical results obtained by Debernardi and Cardona. Some
data do not support the Virtual Crystal Approximation. | Source: | arXiv, 0910.1569 | Services: | Forum | Review | PDF | Favorites |
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