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arXiv · 1007.4021

Magnetic transition and spin fluctuations in the unconventional antiferromagnetic compound Yb3Pt4

S. Zhao·D. E. MacLaughlin·O. O. Bernal·J. M. Mackie·C. Marques·Y. Janssen·M. C. Aronson
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Abstract

Muon spin rotation and relaxation measurements have been carried out on the unconventional antiferromagnet Yb_3Pt_4. Oscillations are observed below T_N = 2.22(1) K, consistent with the antiferromagnetic (AFM) Neel temperature observed in bulk experiments. In agreement with neutron diffraction experiments the oscillation frequency omega_ mu(T) follows a S = 1/2 mean-field temperature dependence, yielding a quasistatic local field 1.71(2) kOe at T = 0. A crude estimate gives an ordered moment of ~0.66 mu_B at T = 0, comparable to 0.81 mu_B from neutron diffraction. As T approaches T_N from above the dynamic relaxation rate lambda_d exhibits no critical slowing down, consistent with a mean-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 and the Korringa constant K_ mu^2 T/lambda_d, with K_ mu the estimated muon Knight shift. A strong suppression of lambda_d by applied field is observed in the AFM phase. These properties are consistent with the observed large Sommerfeld-Wilson and Kadowaki-Woods ratios in Yb_3Pt_4 (although the data do not discriminate between Fermi-liquid and non-Fermi-liquid states), and suggest strong enhancement of q ~ 0 spin correlations between large-Fermi-volume band quasiparticles in the AFM phase of Yb_3Pt_4.

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S. Zhao, D. E. MacLaughlin, O. O. Bernal, J. M. Mackie, C. Marques, Y. Janssen, M. C. Aronson. 2010-07-22. Magnetic transition and spin fluctuations in the unconventional antiferromagnetic compound Yb3Pt4. https://doi.org/10.1088/0953-8984/23/9/094220

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