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Magnetic structure and spin-flop transition in the <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>A</mml:mi></mml:math> -site columnar-ordered quadruple perovskite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>TmMn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
We present the magnetic structure of ${\mathrm{TmMn}}_{3}{\mathrm{O}}_{6}$, solved via neutron powder diffraction. We demonstrate that long-range magnetic order develops below 74 K, and at 28 K a spin-flop transition occurs driven by $f\ensuremath{-}d$ exchange and rare-earth single-ion anisotropy. In both magnetic phases, the magnetic structure may be described as a …