Using path-integral Monte Carlo calculations, we have calculated ring exchange frequencies in the bcc phase of solid 3He for densities from melting to the highest stable density. We evaluate 42 different exchange frequencies from two atoms up to eight atoms and find their Grüneisen exponents. Using a fit to these frequencies, we calculate the contribution to the Curie-Weiss temperature, ΘCW, and upper critical magnetic field, B c2, for even longer exchanges using a lattice Monte Carlo procedure. We find that contributions from seven- and eight-particle exchanges make a significant contribution to ΘCW and Bc2 at melting density. Comparison with experimental data is given.
|Physical Review B - Condensed Matter and Materials Physics
|Published - Aug 23 2011
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics