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Unraveling the complex magnetic structure of multiferroic pyroxene <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>NaFeGe</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math> : A combined experimental and theoretical study
Magnetic order and the underlying magnetic model of the multiferroic pyroxene ${\mathrm{NaFeGe}}_{2}{\mathrm{O}}_{6}$ are systematically investigated by neutron powder diffraction, thermodynamic measurements, density-functional band-structure calculations, and Monte Carlo simulations. Upon cooling, ${\mathrm{NaFeGe}}_{2}{\mathrm{O}}_{6}$ first reveals one-dimensional spin-spin correlations in the paramagnetic state below about 50 K, uncovered by magnetic diffuse scattering. The …