Multi-q Mesoscale Magnetism in CeAuSb2

Guy G. Marcus*, Dae-Jeong Kim, Jacob A. Tutmaher, Jose A. Rodriguez-Rivera, Jonas Okkels Birk, Christof Niedermeyer, Hannoh Lee, Zachary Fisk, Collin L. Broholm

*Corresponding author for this work

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Abstract

We report the discovery of a field driven transition from a single-q to multi-q spin density wave (SDW) in the tetragonal heavy fermion compound CeAuSb2. Polarized along c, the sinusoidal SDW amplitude is 1.8ð2ÞμB/Ce for T ≪ TN ¼ 6.25ð10Þ K with a wave vector q1 ¼ ðη; η; 1/2Þ ½η ¼ 0.136ð2Þ. For Hkc, harmonics appearing at 2q1 evidence a striped magnetic texture below μ∘H1 ¼ 2.78ð1Þ T. Above H1, these are replaced by coupled harmonics at q1 þ q2 ¼ ð2η; 0; 0Þ þ c until μ∘H2 ¼ 5.42ð5Þ T, where satellites vanish and magnetization nonlinearly approaches saturation at 1.64ð2ÞμB/Ce for μ∘H ≈ 7 T.
Original languageEnglish
Article number097201
JournalPhysical Review Letters
Volume120
Issue number9
Number of pages5
ISSN0031-9007
DOIs
Publication statusPublished - 2018

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