Muon Knight shift in d-electron heavy fermion compound Y_0.95Sc_0.05Mn₂

We report on the muon Knight shift in a polycrystalline sample of Y_0.95Sc_0.05Mn₂ that is known as one of the d-electron heavy fermion compounds. Since the muon site is presumed to have a trigonal symmetry, it is expected that the Fourier-transformed (FT) spectrum line shape would exhibit a uni-axial powder pattern which has two edges determined by the parallel and perpendicular components of the Knight shift, K_|| and K_⊥, where K_|| (K_⊥) is proportional to the parallel (perpendicular) component of the spin susceptibility, χ_|| (χ_⊥). The observed FT spectrum at 2 K largely disagrees with the calculated line shape in isotropic (χ_|| = χ_⊥) and anisotropic (χ_|| ≠ χ_⊥) cases, suggesting that there must be field- induced staggered magnetization due to strong antiferromagnetic spin correlations.