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

Zenji Hiroi | Zendy; J. Yamaura | Zendy; Taku Hirose | Zendy; Ikuo Nagashima | Zendy; Yoshihiko Okamoto | Zendy

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

Author(s) -

Zenji Hiroi,

J. Yamaura,

Taku Hirose,

Ikuo Nagashima,

Yoshihiko Okamoto

Publication year - 2015

Publication title -

apl materials

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.571

H-Index - 60

ISSN - 2166-532X

DOI - 10.1063/1.4907734

Subject(s) - pyrochlore , condensed matter physics , materials science , ferromagnetism , magnetization , transition metal , oxide , metal , metal–insulator transition , magnetic moment , magnetic field , physics , chemistry , metallurgy , biochemistry , phase (matter) , quantum mechanics , catalysis

We investigate the metal–insulator transition (MIT) of the osmium pyrochlore oxide Cd2Os2O7 through transport and magnetization measurements. The MIT and a magnetic transition to the all-in/all-out (AIAO) order occur simultaneously at 227 K. We propose a mechanism based on a Lifshitz transition induced by the AIAO magnetic order probably via strong spin–orbit couplings in the specific semimetallic band structure. It is suggested, moreover, that two observed puzzles, a finite conductivity near T = 0 and an emergence of weak ferromagnetic moments, are not bulk properties but originate at magnetic domain walls between two kinds of AIAO domains

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