2010/07/22 by S. Zhao, S Zhao, D. E. MacLaughlin +11
Materials Science · Physics and Astronomy · #Antiferromagnetism #Iron-based superconductors research #Muon #Muon spin spectroscopy #Neutron diffraction #Oscillation (cell signaling) #Phase (matter) #Physics of Superconductivity and Magnetism #Quasiparticle #Rare-earth and actinide compounds #Relaxation (psychology) #Spin (aerodynamics) #cond-mat.str-el
paper · pdf · doi:10.1088/0953-8984/23/9/094220
11 pages, 4 figures, submitted to J. Phys.: Condens. Matter special issue for SCES10
arxiv created 2010/07/22 · openalex publication_date 2011/02/17 · arxiv updated 2015/05/19 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Muon spin rotation and relaxation measurements have been carried out on the unconventional antiferromagnet Yb3Pt4. Oscillations are observed below T(N) = 2.22(1) K, consistent with the antiferromagnetic (AFM) Néel temperature observed in bulk experiments. In agreement with neutron diffraction experiments the oscillation frequency ω(μ)(T)/2π follows an S = 1/2 mean-field temperature dependence, yielding a quasistatic local field of 1.71(2) kOe at T = 0. A crude estimate gives an ordered moment of ∼ 0.66 μ(B) at T = 0, comparable to 0.81 μ(B) from neutron diffraction. As T-->T(N) from above the dynamic relaxation rate λ(d) exhibits no critical slowing down, consistent with a mean-field transition. In the AFM phase a T-linear fit to λ(d)(T), appropriate to a Fermi liquid, yields highly enhanced values of λ(d)/T and the Korringa constant K(μ)(2)T/λ(d), with K(μ) the estimated muon Knight shift. A strong suppression of λ(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 Yb3Pt4 (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 Yb3Pt4.