论文标题
pyrochlore Iridates中可能的Weyl半准状态的演变
Evolution of possible Weyl semimetal states across the hole-doping induced Mott transition in pyrochlore iridates
论文作者
论文摘要
我们通过研究Pyrochlore R2IR2O7（R =稀土离子）中的磁转运性能，研究强相关电子的WEYL半含量，选择三种类型的R离子来设计R 4F和IR 5D时刻之间的交换耦合方案；非磁性欧盟（4F6），各向同性GD（4F7）和各向异性TB（4F8）。在兴奋剂诱导的半金属状态中，由于R = GD和TB化合物在R = GD和TB化合物中观察到了独特的特征，这分别是兑换增强的各向同性和各向异性Zeeman领域的效果，并以2英寸2英寸的2-Oun-2-Oun-2-Oun-2-Ounder Semimimetal Ancories作为prections the expectional fircount。特别是，r = gd化合物的大厅角度强烈提高到1.5％的1.5％以上，高于Mott Transition的临界掺杂。此外，对于r = gd化合物的较低掺杂型制度，可以看出一个非常规的大厅的贡献，这可以归因于Weyl点的出现，并具有场延伸的全面全命令状态。这些发现表明，孔掺杂诱导的Mott过渡以及特征性的F-D交换相互作用可以在广泛的材料参数空间中稳定多功能拓扑半学状态。
We study possible Weyl semimetals of strongly-correlated electrons by investigating magnetotransport properties in pyrochlore R2Ir2O7 (R=rare-earth ions), choosing three types of R ions to design the exchange coupling scheme between R 4f and Ir 5d moments; non-magnetic Eu (4f6), isotropic Gd (4f7), and anisotropic Tb (4f8). In the doping-induced semimetallic state, distinctive features of magnetoresistance and Hall effect are observed in R=Gd and Tb compounds due to the effects of the exchange-enhanced isotropic and anisotropic Zeeman fields, respectively, exemplifying the double Weyl semimetal and the 2-in 2-out line-node semimetal as predicted by theories. In particular, a Hall angle of R=Gd compound is strongly enhanced to 1.5 % near above the critical doping for the Mott transition. Furthermore, an unconventional Hall contribution is discerned for a lower doping regime of R=Gd compound, which can be ascribed to the emergence of Weyl points with the field-distorted all-in all-out order state. These findings indicate that the hole-doping induced Mott transition as well as the characteristic f-d exchange interaction stabilizes versatile topological semimetal states in a wide range of material parameter space.
