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<THO= 17.5 K at q=(100) but not at wave vector transfer q=(001). The peak width indicates correlation lengths c=230(12) \ and a=240(15) . The integrated intensity of the T-dependent peaks corresponds to a sample averaged c-oriented staggered moment of μc=0.022(1) μB at T=1.7 K. The absence of T-dependent diffraction at q=(001) places a limit μ<0.0011 μB on an f- or d-orbital based in-plane staggered magnetic dipole moment, which is associated with multipolar orders proposed for URu2Si2.
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