Gapless Spin Liquid Behavior in Two-Dimensional Solid He3

作者：Ryuichi Masutomi, Yoshitomo Karaki, Hidehiko Ishimoto · 发表于：Physical Review Letters · 年份：2004 · DOI：10.1103/physrevlett.92.025301 · 被引用次数：61 · 研究领域：Quantum, superfluid, helium dynamics、Advanced Condensed Matter Physics、Physics of Superconductivity and Magnetism

Direct demagnetization has been made for two-dimensional solid $^{3}\mathrm{H}\mathrm{e}$ in both the paramagnetic and the antiferromagnetic phases. The lowest temperature is about $10\text{ }\text{ }\ensuremath{\mu}\mathrm{K}$, judging from the observed magnetization for the paramagnetic solid $^{3}\mathrm{H}\mathrm{e}$. The magnetization of the antiferromagnetic solid $^{3}\mathrm{H}\mathrm{e}$ shows a gradual increase to about $10\text{ }\text{ }\ensuremath{\mu}\mathrm{K}$ for the $4/7$ phase adsorbed on both one layer of $^{4}\mathrm{H}\mathrm{e}$ and two layers of HD preplated graphite. This strongly suggests that the triangular antiferromagnet with the higher order multiple exchange has a quantum spin liquid ground state with nearly zero or extremely small spin gap less than $10\text{ }\text{ }\ensuremath{\mu}\mathrm{K}$.