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arXiv · 1403.0526

Fragile antiferromagnetism in the heavy-fermion compound YbBiPt

B. G. Ueland·A. Kreyssig·K. Prokeš·J. W. Lynn·L. W. Harriger·D. K. Pratt·D. K. Singh·T. W. Heitmann·S. Sauerbrei·S. M. Saunders·E. D. Mun·S. L. Bud'ko·R. J. McQueeney·P. C. Canfield·A. I. Goldman
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Abstract

We report results from neutron scattering experiments on single crystals of YbBiPt that demonstrate antiferromagnetic order characterized by a propagation vector, $τ_{\rm{AFM}}$ = ($\frac{1}{2} \frac{1}{2} \frac{1}{2}$), and ordered moments that align along the [1 1 1] direction of the cubic unit cell. We describe the scattering in terms of a two-Gaussian peak fit, which consists of a narrower component that appears below $T_{\rm{N}}~\approx 0.4$ K and corresponds to a magnetic correlation length of $ξ_{\rm{n}} \approx$ 80 $\rmÅ$, and a broad component that persists up to $T^*\approx$ 0.7 K and corresponds to antiferromagnetic correlations extending over $ξ_{\rm{b}} \approx$ 20 $\rmÅ$. Our results illustrate the fragile magnetic order present in YbBiPt and provide a path forward for microscopic investigations of the ground states and fluctuations associated with the purported quantum critical point in this heavy-fermion compound.

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B. G. Ueland, A. Kreyssig, K. Prokeš, J. W. Lynn, L. W. Harriger, D. K. Pratt, D. K. Singh, T. W. Heitmann, S. Sauerbrei, S. M. Saunders, E. D. Mun, S. L. Bud'ko, R. J. McQueeney, P. C. Canfield, A. I. Goldman. 2014-03-03. Fragile antiferromagnetism in the heavy-fermion compound YbBiPt. https://doi.org/10.1103/physrevb.89.180403

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