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Anomalous Antiferromagnetism in Metallic <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math> Determined by Resonant X-ray Scattering
We studied the magnetic ordering of thin films and bulk crystals of rutile ${\mathrm{RuO}}_{2}$ using resonant x-ray scattering across the Ru ${L}_{2}$ absorption edge. Combining polarization analysis and azimuthal angle dependence of the magnetic Bragg signal, we have established the presence and characteristic of collinear antiferromagnetism in ${\mathrm{RuO}}_{2}$ with ${T}_{N}>300\text{ …