Intriguing magnetism of the topological kagome magnet TbMn_6Sn_6

Mielke, C. H.; Ma, Wenlong; Pomjakushin, Vladimir; Zaharko, O.; Liu, X.; Yin, Jiaxin; Tsirkin, Stepan S.; Cochran, Tyler A.; Medarde, M.; Porée, Victor; Das, Debashish; Wang, C.N.; Chang, Jiang; Neupert, Titus; Amato, A.; Jia, Shuang; Hasan, M. Zahid; Luetkens, H.; Guguchia, Zurab

doi:10.48550/arxiv.2101.05763

Cited by 2 publications

(2 citation statements)

References 16 publications

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“…For the magnetic moment of R atoms, experimental values are also varied. The calculated value of m Tb = 9.23 µ B /Tb is nearly identical to the very recent experimental value measured by Mielke and co-workers [41] at 2 K. The calculated m Dy also agrees well with neutron diffraction measurements [15,20,41]. For other R elements, the calculated m R values are generally larger than reported experimental ones.…”

Section: Results On Magnetic Properties a Spin And Orbital Magnetic M...supporting

confidence: 88%

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

Lee¹,

Skomski²,

Wang³

et al. 2022

Preprint

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Kagome-lattice magnets RMn6Sn6 recently emerged as a new platform to exploit the interplay between magnetism and topological electronic states. Using ab initio methods, we systematically investigate the electronic structures and intrinsic magnetic properties in RMn6Sn6 with R = Gd, Tb, Dy, Ho, and Er. We reveal a non-monotonic dependence of the magnetocrystalline anisotropy energy on the spin quantization for all RMn6Sn6, except for R = Gd. Moreover, the Mn sublattice exhibits easy-plane anisotropy of similar amplitude in all RMn6Sn6 compounds. Our results show that TbMn6Sn6 has an easy-axis anisotropy, while DyMn6Sn6 and HoMn6Sn6 have easy-cone anisotropy, and GdMn6Sn6 and ErMn6Sn6 have easy-plane anisotropy. These numerical findings all agree well with the experiment and are fully consistent with the Mn coordination of the R atoms. The observed band structures of various RMn6Sn6 compounds share great similarities near the Fermi level as they mainly consist of non-4f bands. Multiple Dirac crossings occur at the Brillouin zone corners, opened by spin-orbit coupling (SOC). Most of these crossings are strongly kz-dependent. The most prominent 2D-like Dirac crossing that can be effectively gapped by SOC lies ∼ 0.7 eV above the Fermi level, much higher than in previously reported band structures calculated in density functional theory [Ref. 1]. The inclusion of electron correlations within Mn-3d electrons, however, can significantly lower this SOC-gapped crossing closer to the Fermi level, making it more relevant for the observation of topological phenomena. Finally, we predict an enhancement of the Mn magnetic moment on the RMn6Sn6 surface, which may impact the topological band structures of surfaces or thin films, and is yet to be confirmed experimentally.

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Section: Results On Magnetic Properties a Spin And Orbital Magnetic M...supporting

confidence: 88%

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

Lee¹,

Skomski²,

Wang³

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…Interestingly, these compounds show Shubnikov-de Haas quantum oscillations below 14 T field identifying themselves as distinct type of kagome magnets [24]. Despite a few works in transport measurements [9,12,24,[28][29][30] comprehensive magnetic, transport and spectroscopic measurements of the electronic structures of these materials are still limited, therefore, understanding of the potentially interesting obscured quantum phenomena are in demand. Among these materials, ErMn 6 Sn 6 shows a complex magnetic behaviour displaying several transitions.…”

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confidence: 99%

Anisotropically large anomalous and topological Hall effect in a kagome magnet

Dhakal,

Kabeer,

Pathak

et al. 2021

Preprint

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Recently, kagome materials have become an engrossing platform to study the interplay among symmetry, magnetism, topology, and electron correlation. The latest works on RMn6Sn6 (R = rare earth metal) compounds have illustrated that this family could be intriguing to investigate various physical phenomena due to large spin-orbit coupling and strong magnetic ordering. However, combined transport and spectroscopic studies in RMn6Sn6 materials are still limited. Here, we report magnetic, magneto-transport, and angle-resolved photoemission spectroscopy measurements of a kagome magnet ErMn6Sn6 that undergoes antiferromagnetic (TN = 345 K) to ferrimagnetic (TC = 68 K) phase transitions in the presence of field. We observe large anomalous and topological Hall effects serving as transport signatures of the nontrivial Berry curvature. The isothermal magnetization exhibits strong anisotropic nature and the topological Hall effect of the compound depends on the critical field of metamagnetic transition. Our spectroscopic results complemented by theoretical calculations show the multi-orbital kagome fermiology. This work provides new insight into the tunability and interplay of topology and magnetism in a kagome magnet.

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Intriguing magnetism of the topological kagome magnet TbMn_6Sn_6

Cited by 2 publications

References 16 publications

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

Interplay between magnetism and band topology in Kagome magnets $R$Mn$_6$Sn$_6$

Anisotropically large anomalous and topological Hall effect in a kagome magnet

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