Abstract
Bismuth NMR Knight shift and spin lattice relaxation rate 1/ T 1 data are reported between 35 and 325 K in the low-carrier heavy fermion system YbBiPt. The Knight shift is strongly temperature dependent and negative. Its temperature dependence tracks the bulk susceptibility with a hyperfine coupling constant A hf = −7.88 kOe/ μ B. At low temperatures 1/ T 1 exhibits a dramatic increase, such that the average 4f spin correlation time τ f shows a crossover behavior at about 75 K. The rate 1 τ f is proportional to temperature above 75 K, consistent with non-interacting 4f local moments which are relaxed via Korringa-type scattering with the conduction electrons. We discuss the behavior below 75 K in terms of crystal-field effects or a strongly temperature dependent contribution from non-zero q regime of the dynamical susceptibility.
Highlights
The discovery of a large y in the heavy-electron compound YbBiPt has attracted a number of recent investigations [1,2,3]
YbBiPt has a very large Sommerfeld constant ( y = 8 J/mol K 2) and possesses an apparent small-moment [4], spin-density wave [5] transition at 0.4 K which gaps part of the Fermi surface and which arises from a low-carrier density heavy electron state
Many interesting aspects of this compound occur at low temperatures ( < 1 K), it is important to investigate other relevant properties at high temperatures
Summary
The discovery of a large y in the heavy-electron compound YbBiPt has attracted a number of recent investigations [1,2,3]. The quality of our sample was verified by measuring the temperature dependence of the susceptibility after the NMR data were taken. These facts suggest that the Knight shift is mainly due to a transferred hyperfine field from Yb 4f-moments.
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