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Extremely Large Magnetoresistance in the Hourglass Dirac Loop Chain Metal β-ReO2
Journal of the Physical Society of Japan ( IF 1.5 ) Pub Date : 2021-08-17 , DOI: 10.7566/jpsj.90.094708
Daigorou Hirai 1 , Takahito Anbai 1 , Shinya Uji 2 , Tamio Oguchi 3, 4 , Zenji Hiroi 1
Affiliation  

The transport and thermodynamic properties of β-ReO2 crystallizing in a nonsymmorphic structure were studied using high-quality single crystals. An extremely large magnetoresistance (XMR) of 22,000% was observed in a transverse magnetic field of 10 T at 2 K. However, unlike other topological semimetals that show XMR, β-ReO2 has a high electron carrier density of 1 × 1022 cm−3, as determined by Hall effect measurements and large Fermi surfaces in the electronic structure. In addition, a small Fermi surface with a small effective mass was evidenced by de Haas–van Alphen oscillation measurements. Previous band structure calculations [Wang, et al., Nat. Commun. 8, 1844 (2017)] revealed the existence of two types of loops made of Dirac points of hourglass-shaped dispersions that are connected to each other by a point to form a string of alternating loops, called a Dirac loop chain (DLC), which are protected by multiple glide symmetries. Our first-principles calculations revealed the complex Fermi surfaces, the smallest of which corresponds to the observed small Fermi surface, which is located near the DLC. The XMR of β-ReO2 is attributed to the small Fermi surface, which is likely caused by the DLC.

中文翻译:

沙漏狄拉克环链金属 β-ReO2 中的极大磁阻

使用高质量单晶研究了以非对称结构结晶的 β-ReO 2的输运和热力学性质。在 2 K、10 T 的横向磁场中观察到 22,000% 的极大磁阻 (XMR)。然而,与其他显示 XMR 的拓扑半金属不同,β-ReO 2具有 1 × 10 22 cm的高电子载流子密度-3,由霍尔效应测量和电子结构中的大费米面确定。此外,de Haas-van Alphen 振荡测量证明了具有小有效质量的小费米面。以前的能带结构计算 [Wang, et al., Nat. 社区。8, 1844 (2017)] 揭示了两种由沙漏形色散的狄拉克点组成的环的存在,这些环通过一个点相互连接形成一串交替的环,称为狄拉克环链 (DLC),受到多重滑动对称性的保护。我们的第一性原理计算揭示了复杂的费米面,其中最小的对应于观察到的位于 DLC 附近的小费米面。β-ReO 2的 XMR归因于小费米面,这可能是由 DLC 引起的。
更新日期:2021-08-17
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