Quasi-One-Dimensional Spin Dynamics in d-Electron Heavy-Fermion Metal Y₁₋ₓScₓMn₂

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Slow spin fluctuations (ν< 10¹² s-1) observed by the muon spin relaxation technique in Y₁₋ₓScₓMn₂ exhibits a power law dependence on temperature (ν∝ Tα), where the power converges asymptotically to unity (α→ 1) as the system moves away from spin-glass instability with increasing Sc content x. This linear T dependence, which is common to that observed in LiV₂O₄, is in line with the prediction of the "intersecting Hubbard chains" model for a metallic pyrochlore lattice, suggesting that the geometrical constraints to t2g bands specific to the pyrochlore structure serve as a basis of the d-electron heavy-fermion state.