Nuclear Ferromagnetic and Antiferromagnetic Exchange in Thin Films of 3 He Adsorbed on Graphite

作者：C. P. Lusher, John H Saunders, Brian P. Cowan · 发表于：Europhysics Letters (EPL) · 年份：1991 · DOI：10.1209/0295-5075/14/8/015 · 被引用次数：81 · 研究领域：Quantum, superfluid, helium dynamics、Atomic and Subatomic Physics Research、Physics of Superconductivity and Magnetism

Measurements of the nuclear magnetic susceptibility of multilayer films of 3 He adsorbed on graphite plated with a monolayer of 4 He are reported for 3 He surface densities up to 0.27 Å -2 and temperatures in the range (6÷600) mK. The coverage dependence of the exchange constant has been measured; this is antiferromagnetic when the second layer first solidifies and becomes ferromagnetic with the formation of a fluid overlayer. The second-layer solid density evolves in a stepwise fashion with increasing coverage, while the susceptibility of the fluid overlayer shows structure associated with layering in the film.