Fluid and registered phases in the second layer of He-3 on graphite

Article

关键词: LOW MILLIKELVIN TEMPERATURES;    HEAT-CAPACITY;    FILMS;    LIQUID-HE-3;    FRUSTRATION;    MONOLAYER;    EXCHANGE;    REGIME;   

DOI  :  10.1103/PhysRevB.97.201410

来源: SCIE

【 摘 要 】

A quantum Monte Carlo approach, considering all the corrugation effects, was used to calculate the complete phase diagram of the second He-3 layer adsorbed on graphite. We found that a first-layer triangular solid was in equilibrium with a gas in the second layer. At a surface density 0.166 +/- 0.001 angstrom(-2), this fluid changes into two first-layer registered phases: 4/7 and 7/12 solids. The 7/12 arrangement transforms into an incommensurate triangular structure of rho= 0.189 +/- 0.001 angstrom(-2) upon further helium loading. A recently proposed hexatic phase was found to be unstable with respect to those commensurate solids.

【 授权许可】

Free