Unexpected band structure changes within the higher-temperature antiferromagnetic state of CeBi

IF 7.5 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Communications Materials Pub Date : 2024-11-07 DOI:10.1038/s43246-024-00692-0
Yevhen Kushnirenko, Brinda Kuthanazhi, Benjamin Schrunk, Evan O’Leary, Andrew Eaton, Robert-Jan Slager, Junyeong Ahn, Lin-Lin Wang, Paul C. Canfield, Adam Kaminski
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Abstract

The interest in the rare-earth monopnictides was boosted after the discovery of unconventional surface-state pairs in antiferromagnetically ordered NdBi. In contrast to other materials in which such states were reported, CeBi is known to have multiple antiferromagnetic phases. In this study, we perform angle-resolved photoemission spectroscopy (ARPES) measurements in conjunction with density functional theory (DFT) calculations to investigate the evolution of the electronic structure of CeBi upon a series of antiferromagnetic (AFM) transitions. We find evidence for a new AFM transition in addition to two previously known from transport studies. We demonstrate the development of an additional Dirac state in the ( + − + − ) ordered phase and a transformation of unconventional surface-state pairs in the ( + + − − ) ordered phase. This revises the phase diagram of this intriguing material, where there are now three distinct AFM states below TN in zero magnetic field instead of two as it was previously thought. Rare-earth mono-pnictides antiferromagnets have generated recent interest as hosts to topological states and unconventional magnetic states. Here, angle-resolved photoemission spectroscopy reveals a hidden band-structure transition within the higher-temperature antiferromagnetic state of CeBi.

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铋铈高温反铁磁态的意外带状结构变化
在反铁磁有序掺杂铋(NdBi)中发现非常规表面态对后,人们对稀土单锑化物的兴趣大增。与其他报道了此类状态的材料不同,已知 CeBi 具有多个反铁磁相。在本研究中,我们结合密度泛函理论(DFT)计算,进行了角度分辨光发射光谱(ARPES)测量,以研究一系列反铁磁(AFM)跃迁后硒化钴电子结构的演变。除了之前通过输运研究发现的两种反铁磁性转变外,我们还发现了一种新的反铁磁性转变的证据。我们证明了( + - + - )有序相中一个额外的狄拉克态的发展,以及( + + - - )有序相中非常规表面态对的转变。这修正了这种有趣材料的相图,在零磁场中,TN 以下有三种不同的 AFM 状态,而不是之前认为的两种。稀土单锑化物反铁磁体作为拓扑态和非常规磁态的宿主,最近引起了人们的兴趣。在这里,角度分辨光发射光谱揭示了 CeBi 高温反铁磁态中隐藏的带状结构转变。
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来源期刊
Communications Materials
Communications Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
12.10
自引率
1.30%
发文量
85
审稿时长
17 weeks
期刊介绍: Communications Materials, a selective open access journal within Nature Portfolio, is dedicated to publishing top-tier research, reviews, and commentary across all facets of materials science. The journal showcases significant advancements in specialized research areas, encompassing both fundamental and applied studies. Serving as an open access option for materials sciences, Communications Materials applies less stringent criteria for impact and significance compared to Nature-branded journals, including Nature Communications.
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