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Ferroelectricity induced by ferriaxial crystal rotation and spin helicity in a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>B</mml:mi></mml:math>-site-ordered double-perovskite multiferroic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mtext>In</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mtext>NiMnO</mml:mtext><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
We have performed dielectric measurements and neutron diffraction experiments on the double perovskite ${\text{In}}_{2}{\text{NiMnO}}_{6}$. A ferroelectric polarization, $P\ensuremath{\simeq}30\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{C}/{\mathrm{m}}^{2},$ is observed in a polycrystalline sample below ${T}_{N}=$ 26 K where a magnetic phase transition occurs. The neutron diffraction experiment demonstrates that a complex noncollinear magnetic structure with ``cycloidal'' and ``proper screw'' …