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Incommensurate magnetic structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeRhIn</mml:mi></mml:mrow><mml:mrow><mml:mn>5</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
The magnetic structure of the heavy fermion antiferromagnet ${\mathrm{CeRhIn}}_{5}$ is determined using neutron diffraction. We find a magnetic wave vector ${\mathbf{q}}_{M}=(1/2,1/2,0.297),$ which is temperature independent up to ${T}_{N}=3.8 \mathrm{K}.$ A staggered moment of $0.264(4){\ensuremath{\mu}}_{B}$ at 1.4 K, residing on the Ce ion, spirals transversely along the c axis. The nearest-neighbor …