论文标题
227个pyrochlore触发的竞争磁性和多极的韦尔福果
Competing magnetic orders and multipolar Weyl fermions in 227 pyrochlore iridates
论文作者
论文摘要
由于基于强烈的自旋轨道耦合和哈伯德相互作用，基于虹膜的227 pyrochlore氧化物具有丰富的竞争磁性和新出现的多极韦尔准粒子的融合。 Here we show that this family of materials is predominantly susceptible toward the nucleation of electronic noncoplanar all-in all-out (AIAO) and three-in one-out (3I1O) orders, respectively transforming under the singlet $A_{2u}$ and triplet $T_{1u}$ representations, supporting octupolar and dipolar Weyl fermions, and favored by strong on-site Hubbard and最近的邻里铁磁相互作用。此外，一般是它们之间的共面磁序，它们是它们之间的中间相。该订单在三重态下转换为$ t_ {2u} $表示，还托管了八极极性韦尔弗里米斯。随着AIAO和3I1O阶段的可能被实现（nd $ _ {1-x} $ pr $ _ {x} $）$ _ 2 $ _ 2 $ ir $ $ _2 $ _2 $ $ $ _7 $当$ x = 0 $ x = 0 $和1时，中$ t_ {2u} $在$ t_ {2u} $上可能会发现$ 0 <<x $ 0 <x （静液压）nd $ _2 $ ir $ _2 $ o $ _7 $。
Owing to comparably strong spin-orbit coupling and Hubbard interaction, iridium based 227 pyrochlore oxides harbor a rich confluence of competing magnetic orders and emergent multipolar Weyl quasiparticles. Here we show that this family of materials is predominantly susceptible toward the nucleation of electronic noncoplanar all-in all-out (AIAO) and three-in one-out (3I1O) orders, respectively transforming under the singlet $A_{2u}$ and triplet $T_{1u}$ representations, supporting octupolar and dipolar Weyl fermions, and favored by strong on-site Hubbard and nearest-neighbor ferromagnetic interaction. Furthermore, a coplanar magnetic order generically appears as an intermediate phase between them. This order transforms under the triplet $T_{2u}$ representation and also hosts octupolar Weyl fermions. With the AIAO and 3I1O phases possibly being realized in (Nd$_{1-x}$Pr$_{x}$)$_2$Ir$_2$O$_7$ when $x=0$ and 1, respectively, the intervening $T_{2u}$ order can in principle be found at an intermediate doping ($0<x<1$) or in pressured (hydrostatic) Nd$_2$Ir$_2$O$_7$.
