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We demonstrate, by considering the triangular lattice spin-1/2 Heisenbergmodel, that Monte Carlo sampling of skeleton Feynman diagrams within thefermionization framework offers a universal first-principles tool for stronglycorrelated lattice quantum systems. We observe the fermionic signblessing---cancellation of higher order diagrams leading to a finiteconvergence radius of the series. We calculate the magnetic susceptibility ofthe triangular-lattice quantum antiferromagnet in the correlated paramagnetregime and reveal a surprisingly accurate microscopic correspondence with itsclassical counterpart at all accessible temperatures. The extrapolation of theobserved relation to zero temperature suggests the absence of the magneticorder in the ground state. We critically examine the implications of thisunusual scenario.

Bold Diagrammatic Monte Carlo Method Applied to Fermionized Frustrated Spins