Strict limit on in-plane ordered magnetic dipole moment in URu2Si2

Abstract

Neutron diffraction is used to examine the polarization of weak static antiferromagnetism in high quality single crystalline URu2Si2. As previously documented, elastic Bragg-like diffraction develops for temperature T<T_{HO}= 17.5 K at q=(100) but not at wave vector transfer q=(001). The peak width indicates correlation lengths ξ_c=230(12) Å\ and ξ_a=240(15) Å. The integrated intensity of the T-dependent peaks corresponds to a sample averaged c-oriented staggered moment of μ_{c}=0.022(1) μ_B at T=1.7 K. The absence of T-dependent diffraction at q=(001) places a limit μ_{\perp}<0.0011 μ_B on an f- or d-orbital based in-plane staggered magnetic dipole moment, which is associated with multipolar orders proposed for URu_2Si_2.

9 pages, 7 figures

References in corpus (7)

• Rotational Symmetry Breaking in the Hidden-Order Phase of URu2Si2
• Gapped itinerant spin excitations account for missing entropy in the hidden order state of URu${}_2$Si${}_2$
• Emergent Rank-5 'Nematic' Order in URu2Si2
• Hastatic Order in URu2Si2
• The modulated spin liquid: a new paradigm for URu${}_2$Si${}_2$
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• Cyclotron Resonance in the Hidden-Order Phase of URu2Si2

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• Electronic properties of a heavy-fermion U(Ru0.92Rh0.08)2Si2 single crystal
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• A Model for Metastable Magnetism in the Hidden-Order Phase of URu2Si2
• Unified Theory of Hastatic order and Antiferromagnetism in URu${}_2$Si${}_2$