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Spin and orbital ordering in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>TlMnO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>: Neutron diffraction study
Crystal and magnetic structures of the high-pressure stabilized perovskite phase of ${\mathrm{TlMnO}}_{3}$ have been studied by neutron powder diffraction. The crystal structure involves two types of primary structural distortions: ${a}^{+}{b}^{\ensuremath{-}}{b}^{\ensuremath{-}}$ octahedral tilting and antiferrodistortive type of orbital ordering, whose common action reduces the symmetry down to triclinic $P\overline{1}$. The orbital …