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arXiv · 1402.2689

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

K. A. Ross·L. Harriger·Z. Yamani·W. J. L. Buyers·J. D. Garrett·A. A. Menovsky·J. A. Mydosh·C. L. Broholm
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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.

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K. A. Ross, L. Harriger, Z. Yamani, W. J. L. Buyers, J. D. Garrett, A. A. Menovsky, J. A. Mydosh, C. L. Broholm. 2014-02-11. Strict limit on in-plane ordered magnetic dipole moment in URu2Si2. https://doi.org/10.1103/physrevb.89.155122

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