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Originally published in Science Express on 3 November 2005
Science 18 November 2005:
Vol. 310. no. 5751, pp. 1164 - 1166
DOI: 10.1126/science.1118625
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Reports

Thermodynamics of an Incommensurate Quantum Crystal

P. W. Anderson, W. F. Brinkman, David A. Huse*

We present a theory of the thermodynamics of an incommensurate quantum solid. The ground state of the solid is assumed to be an incommensurate crystal, with quantum zero-point vacancies and interstitials and thus a non-integer number of atoms per unit cell. We show that at low temperature T, the variation of the net vacancy concentration should be as T4 and that the first correction to the specific heat due to this varies as T7; these are quite consistent with experiments on solid helium-4. We also make some observations about the recent experimental reports of "supersolidity" in solid helium-4 that motivate a renewed interest in quantum crystals.

Department of Physics, Princeton University, Princeton, NJ 08544, USA.

* To whom correspondence should be addressed. E-mail: huse{at}princeton.edu

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THIS ARTICLE HAS BEEN CITED BY OTHER ARTICLES:
Superfluidity of Grain Boundaries and Supersolid Behavior.
S. Sasaki, R. Ishiguro, F. Caupin, H. J. Maris, and S. Balibar (2006)
Science 313, 1098-1100
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