标题： 由尖晶石氧化物Cd2Os2O7中的全入/全出磁序引起的Lifshitz金属-绝缘体转变 显示英文标题

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

摘要： 我们通过输运和磁化测量研究了锇类钙钛矿氧化物Cd2Os2O7的金属-绝缘体转变（MIT）。在227 K时，MIT和向全入/全出（AIAO）有序的磁性转变同时发生。我们提出了一种机制，该机制基于由AIAO磁序引起的利什曼转变，可能通过特定半金属性能带结构中的强自旋-轨道耦合。此外，建议观察到的两个谜题，即接近T = 0时的有限电导率和弱铁磁矩的出现，并不是体性质，而是来源于两种AIAO畴之间的磁畴壁。 显示英文摘要

摘要： 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.