INCOMMENSURABILITY OF HCP SOLID 4 He QUANTUM CRYSTAL

Chelimo, Khanna, Rapando, Kandie, Masinde, Bitok
2013 International Journal of Physics and Mathematical Sciences   unpublished
The thermodynamic properties of an incommensurate hcp solid 4 he quantum crystal are calculated. The ground state of a quantum crystal is assumed to be incommensurate with point defects; zero-point vacancies and interstitials. We show that vacancies contribution to the specific heat varies as t 3/2 .the vacancy contribution to the specific heat increases at larger temperatures due to thermal excitations. The correction to the specific heat due to both phonon dispersion and vacancies is
more » ... cancies is reminiscent of what has been found experimentally.
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