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Muon spin rotation and relaxation measurements have been carried out on theunconventional antiferromagnet Yb_3Pt_4. Oscillations are observed below T_N =2.22(1) K, consistent with the antiferromagnetic (AFM) Neel temperatureobserved in bulk experiments. In agreement with neutron diffraction experimentsthe oscillation frequency omega_ mu(T) follows a S = 1/2 mean-field temperaturedependence, yielding a quasistatic local field 1.71(2) kOe at T = 0. A crudeestimate gives an ordered moment of ~0.66 mu_B at T = 0, comparable to 0.81mu_B from neutron diffraction. As T approaches T_N from above the dynamicrelaxation rate lambda_d exhibits no critical slowing down, consistent with amean-field transition. In the AFM phase a T-linear fit to lambda_d(T),appropriate to a Fermi liquid, yields highly enhanced values of lambda_d/T andthe Korringa constant K_ mu^2 T/lambda_d, with K_ mu the estimated muon Knightshift. A strong suppression of lambda_d by applied field is observed in the AFMphase. These properties are consistent with the observed largeSommerfeld-Wilson and Kadowaki-Woods ratios in Yb_3Pt_4 (although the data donot discriminate between Fermi-liquid and non-Fermi-liquid states), and suggeststrong enhancement of q ~ 0 spin correlations between large-Fermi-volume bandquasiparticles in the AFM phase of Yb_3Pt_4.

Magnetic transition and spin fluctuations in the unconventional antiferromagnetic compound Yb3Pt4