On the spin-liquid phase of two-dimensional3He

作者：Eddy Collin, Yu. M. Bunkov, Henri Godfrin · 发表于：Journal of Physics Condensed Matter · 年份：2004 · DOI：10.1088/0953-8984/16/11/017 · 被引用次数：5 · 研究领域：Advanced Condensed Matter Physics、Quantum, superfluid, helium dynamics、Physics of Superconductivity and Magnetism

Multiple spin exchange processes lead to strong quantum frustration in low density solid phases of 3 He. It has been predicted theoretically that the 4/7 phase of the second layer of 3 He adsorbed on graphite is a two-dimensional RVB magnet with a spin-liquid ground state. We have measured the nuclear magnetization of the second layer of 3 He adsorbed on a Papyex substrate preplated by a monolayer of 4 He, using cw-NMR techniques, for a large temperature range (0.1–400 mK). Special attention has been devoted to carefully eliminating from our sample spurious phases and paramagnetic defects. The analysis of the data provides us with information on the presence of a spin gap in the excitation spectrum and on the density of states of the magnetic excitations of this phase.