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Colossal magnetoresistance is of great fundamental and technologicalsignificance and exists mostly in the manganites and a few other materials.Here we report colossal magnetoresistance that is starkly different from thatin all other materials. The stoichiometric Mn3Si2Te6 is an insulator featuringa ferrimagnetic transition at 78 K. The resistivity drops by 7 orders ofmagnitude with an applied magnetic field above 9 Tesla, leading to aninsulator-metal transition at up to 130 K. However, the colossalmagnetoresistance occurs only when the magnetic field is applied along themagnetic hard axis and is surprisingly absent when the magnetic field isapplied along the magnetic easy axis where magnetization is fully saturated.The anisotropy field separating the easy and hard axes is 13 Tesla, unexpectedfor the Mn ions with nominally negligible orbital momentum and spin-orbitinteractions. Double exchange and Jahn-Teller distortions that drive thehole-doped manganites do not exist in Mn3Si2Te6. The phenomena fit no existingmodels, suggesting a unique, intriguing type of electrical transport.

Strange electrical transport: Colossal magnetoresistance via avoiding fully polarized magnetization in ferrimagnetic insulator Mn3Si2Te6