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Fragile antiferromagnetism in the heavy-fermion compound YbBiPt

TitleFragile antiferromagnetism in the heavy-fermion compound YbBiPt
Publication TypeJournal Article
Year of Publication2014
AuthorsUeland, BG, Kreyssig, A, Prokes, K, Lynn, JW, Harriger, LW, Pratt, DK, Singh, DK, Heitmann, TW, Sauerbrei, S, Saunders, SM, Mun, ED, Bud'ko, SL, McQueeney, RJ, Canfield, PC, Goldman, AI
JournalPhysical Review B
Date Published05
Type of ArticleArticle
ISBN Number1098-0121
Accession NumberWOS:000335534600002
Keywordsbehavior, cecu6-xaux, critical-point, criticality, electron, magnetism, quantum phase-transitions, surface, systems, temperature

We report results from neutron scattering experiments on single crystals of YbBiPt that demonstrate antiferromagnetic order characterized by a propagation vector, tau(AFM) = ( 1/2 1/2 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-N approximate to 0.4 K and corresponds to a magnetic correlation length of xi(n) approximate to 80 angstrom, and a broad component that persists up to T-* approximate to 0.7 K and corresponds to antiferromagnetic correlations extending over xi(b) approximate to 20 angstrom. 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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