Anomalous low temperature specific heat of He-3 inside nanotube bundles

Details Anomalous low temperature specific heat of He-3 inside nanotube bundles Anomalous low temperature specific heat of He-3 inside nanotube bundles

2004-04-14

arxiv.org/abs/cond-mat/0404345v1

Physics

Condensed Matter

Materials Science

11 pages, 6 figures

Scientific paper

10.1023/B:JOLT.0000038521.03196.

Helium atoms and hydrogen molecules can be strongly bound inside interstitial channels within bundles of carbon nanotubes. An exploration of the low energy and low temperature properties of He-3 atoms is presented here. Recent study of the analogous He-4 system has shown that the effect of heterogeneity is to yield a density of states N(E) that is qualitatively different from the one-dimensional (1D) form of N(E) that would occur for an ideal set of identical channels. In particular, the functional form of N(E) is that of a 4D gas near the very lowest energies and a 2D gas at somewhat higher energies. Similar behavior is found here for He-3. The resulting thermodynamic behavior of this fermi system is computed, yielding an anomalous form of the heat capacity and its dependence on coverage.

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