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We show theoretically that the second layer of 3He adsorbed on graphite andsolidified at 4/7 of the first-layer density is close to the fluid-solidboundary with substantial density fluctuations on the third layer. The solidshows a translational symmetry breaking as in charge-ordered insulators ofelectronic systems. We construct a minimal model beyond the multiple-exchangeHeisenberg model. An unexpectedly large magnetic field required for themeasured saturation of magnetization is well explained by the densityfluctuations. The emergence of quantum spin liquid is understood from the samemechanism as in the Hubbard model and in \kappa-(ET)_2Cu_2(CN)_3 near the Motttransitions.

What is Minimal Model of 3He Adsorbed on Graphite? -Importance of Density Fluctuations in 4/7 Registered Solid -