期刊
SCIENCE
卷 310, 期 5751, 页码 1164-1166出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.1118625
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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 T-4 and that the first correction to the specific heat due to this varies as T-7; 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.
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