Possible role of 3 He impurities in solid 4 He
نویسندگان
چکیده
منابع مشابه
2 3 A pr 2 00 7 epl draft Possible role of 3 He impurities in solid 4 He
We use a quantum lattice gas model to describe essential aspects of the motion of He atoms and of He impurities in solid He. This study suggests that He impurities bind to defects and promote He atoms to interstitial sites which can turn the bosonic quantum disordered crystal into a metastable supersolid. It is suggested that defects and interstitial atoms are produced during the solid He nucle...
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We have studied the stability of mixed (3)He/(4)He clusters in L=0 states by the diffusion Monte Carlo method, employing the Tang-Toennies-Yiu He-He potential. The clusters (3)He(4)He(N) and (3)He(2)(4)He(N) are stable for N>1. The lighter atoms tend to move to the surface of the cluster. The minimum number of 4He atoms able to bind three 3He atoms in a L=0 state is nine. Two of three fermionic...
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In this work we present the predictions of a modified version of the “two-infall model” (Chiappini et al. 1997) for the evolution of He, He and D in the Galaxy, as well as their distributions along the Galactic disk. In particular, we show that when allowing for extra-mixing process in low mass stars (M< 2.5 M⊙), as predicted by Charbonnel and do Nascimento (1998), a long standing problem in ch...
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The Debye-Waller factor and the mean-squared displacement from lattice sites for solid He and He were calculated with path-integral Monte Carlo at temperatures between 5 and 35 K, and densities between 38 and 67 nm. It was found that the mean-squared displacement exhibits finite-size scaling consistent with a crossover between the quantum and classical limits of N and N, respectively. The tempe...
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X-ray synchrotron radiation was used to measure Debye-Waller factors of helium crystals for both He and He in both hcp and fcc phases. To our knowledge, there are no previous measurements for He. The ranges studied for He and He crystals were 11.52–12.82 and 10.95–12.13 cm, respectively, and 11.5–18.2 and 12.0–20.3 K. With small uncertainty, only a Gaussian dependence upon momentum transfer Q w...
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ژورنال
عنوان ژورنال: Europhysics Letters (EPL)
سال: 2007
ISSN: 0295-5075,1286-4854
DOI: 10.1209/0295-5075/78/36002