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Colossal magnetoresistance via avoiding fully polarized magnetization in the ferrimagnetic insulator <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Mn</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Te</mml:mi><mml:mn>6</mml:mn></mml:msub></mml:mrow></mml:math>
Magnetic polarization reduces spin scattering and underpins colossal magnetoresistance (CMR) in the manganites and almost all other CMR materials. In sharp contrast, the observed CMR in the ferrimagnetic insulator Mn${}_{3}$Si${}_{2}$Te${}_{6}$, which features a resistivity drop by an astonishing seven orders of magnitude, emerges only when the fully polarized magnetization is …