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We investigate the metal-insulator transition (MIT) of the osmium pyrochloreoxide Cd2Os2O7 through transport and magnetization measurements. The MIT and amagnetic transition to the all-in/all-out (AIAO) order occur simultaneously at227 K. We propose a mechanism based on a Lifshitz transition induced by theAIAO magnetic order probably via strong spin-orbit couplings in the specificsemimetallic band structure. It is suggested, moreover, that two observedpuzzles, a finite conductivity near T = 0 and an emergence of weakferromagnetic moments, are not bulk properties but originate at magnetic domainwalls between two kinds of AIAO domains.

Lifshitz metal-insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd2Os2O7