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Title: Lifshitz metal–insulator transition induced by the all-in/all-out magnetic order in the pyrochlore oxide Cd{sub 2}Os{sub 2}O{sub 7}

We investigate the metal–insulator transition (MIT) of the osmium pyrochlore oxide Cd{sub 2}Os{sub 2}O{sub 7} 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.
Authors:
; ; ;  [1] ;  [2]
  1. Institute for Solid State Physics, University of Tokyo, Kashiwa, Chiba 277–8581 (Japan)
  2. Materials Research Center for Element Strategy, Tokyo Institute of Technology, Yokohama, Kanagawa 226–8503 (Japan)
Publication Date:
OSTI Identifier:
22415267
Resource Type:
Journal Article
Resource Relation:
Journal Name: APL materials; Journal Volume: 3; Journal Issue: 4; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CADMIUM COMPOUNDS; DOMAIN STRUCTURE; ELECTRIC CONDUCTIVITY; ELECTRONIC STRUCTURE; L-S COUPLING; MAGNETISM; MAGNETIZATION; OSMIUM OXIDES; PHASE TRANSFORMATIONS; PYROCHLORE; TEMPERATURE DEPENDENCE