Abstract
The exchange frequency in crystal He3 is calculated from first principles with a combination of path-integral Monte Carlo method and a method used in classical statistical mechanics to determine free-energy differences. The frequency of nearest-neighbor exchange at melting density is 0.46 mK, that of triple exchange is 0.19 mK, and that of four-particle planar exchange is 0.27 mK. These exchange frequencies are within 30% of the values obtained from the empirical multiple-exchange model and agree with measurements. Many other types of high-order cyclic exchanges make significant contributions to thermodynamic properties, showing that He3 is more complex than previously thought.
Original language | English (US) |
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Pages (from-to) | 1648-1651 |
Number of pages | 4 |
Journal | Physical review letters |
Volume | 58 |
Issue number | 16 |
DOIs | |
State | Published - 1987 |
Externally published | Yes |
ASJC Scopus subject areas
- General Physics and Astronomy