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The collapse points to a common population of weakly bound spin pairs, but no microscopic theory has yet predicted the exponent for a specific material.","posed_since":"2018","precise":"In H3LiIr2O6 and several other disordered frustrated magnets the data obey $C/T \\sim T^{-\\gamma} F_C(\\mu_B H/k_B T)$ and $M \\sim H^{(1-\\gamma)} F_M(\\mu_B H/k_B T)$ with a material-dependent $\\gamma$ between 0 and 1 (Kimchi, Sheckelton, McQueen, Lee, Nature Communications 2018), attributed to a power-law distribution of singlet energies $P(J) \\sim J^{-\\gamma}$. Derive $\\gamma$ and the scaling functions $F_C, F_M$ from a microscopic disordered model of at least one compound, and determine whether $\\gamma$ is fixed by a 2D random-singlet fixed point or is nonuniversal. An answer is a model whose computed $\\gamma$ and $F_C$ agree with the data without fitting $\\gamma$.","problem_ref":null,"references":"","settled_by":"Strong-disorder renormalization or quantum Monte Carlo of a calibrated random-exchange model that reproduces the measured $\\gamma$ and scaling functions of one compound.","status_note":"","title":"Origin of universal H/T scaling in disordered frustrated 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