Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>TbMn</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Sn</mml:mi></mml:mrow><mml:mrow><mml:mn>6</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Riberolles, S. X. M.; Slade, Tyler J.; Abernathy, D. L.; Granroth, G. E.; Li, Bing; Lee, Y.; Canfield, Paul C.; Ueland, B. G.; Ke, Liqin; McQueeney, R. J.

doi:10.1103/physrevx.12.021043

Cited by 23 publications

(20 citation statements)

References 45 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Experimental data. Tb166 has been shown to host a complex spin wave dispersion characterized by large intralayer ferromagnetic Mn-Mn exchange coupling and competing Mn-Mn and Mn-Tb interlayer couplings with excitations that extend beyond 200 meV [24]. Third, broad excitations associated with orbital excitons begin to appear below 10 meV at 150 K and grow in strength.…”

Section: Resultsmentioning

confidence: 99%

“…where J M M ij represent various, and quite strong, intralayer and interlayer magnetic couplings between Mn spins (s), as described in detail in Ref. [24]. Here, J M T > 0 is the AF coupling between neighboring Mn and Tb spins (S) that result in tightly bound Mn-Tb-Mn collinear ferrimagnetic trilayers.…”

Section: The Heisenberg Hamiltonian Ismentioning

confidence: 99%

“…to the ground state dispersion as obtained from fits to the Heisenberg model described in Ref. [24].…”

Section: Code Availabilitymentioning

confidence: 99%

See 2 more Smart Citations

Orbital character of the spin-reorientation transition in TbMn$_6$Sn$_6$

Riberolles¹,

Slade²,

Dally³

et al. 2023

Preprint

View full text Add to dashboard Cite

Ferromagnetic (FM) order in a two-dimensional kagome layer is predicted to generate a topological Chern insulator without an applied magnetic field. The Chern gap is largest when spin moments point perpendicular to the kagome layer, enabling the capability to switch topological transport properties, such as the quantum anomalous Hall effect, by controlling the spin orientation. In TbMn 6 Sn 6 , the uniaxial magnetic anisotropy of the Tb 3+ ion is effective at generating the Chern state within the FM Mn kagome layers while a spin-reorientation (SR) transition to easy-plane order above T SR = 310 K provides a mechanism for switching. Here, we use inelastic neutron scattering to provide key insights into the fundamental nature of the SR transition. The observation of two Tb excitations, which are split by the magnetic anisotropy energy, indicates an effective two-state orbital character for the Tb ion, with a uniaxial ground state and an isotropic excited state. The simultaneous observation of both modes below T SR confirms that orbital fluctuations are slow on magnetic and electronic time scales < ps and act as a spatially-random orbital alloy. A thermally-driven critical concentration of isotropic Tb ions triggers the SR transition.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: The Heisenberg Hamiltonian Ismentioning

confidence: 99%

See 1 more Smart Citation

Orbital character of the spin-reorientation transition in TbMn$_6$Sn$_6$

Riberolles¹,

Slade²,

Dally³

et al. 2023

Preprint

View full text Add to dashboard Cite

show abstract

“…Rare-earth (R) material class RMn 6 Sn 6 displays rich and intricate physical phenomena consisting of strong electron-electron correlations, spin-orbit effects, and supposedly topological behavior [1][2][3][4][5][6][7][8][9][10]. These materials belong to the P 6/mmm (#191) space group, where Mn atoms form 2D kagome layers interlaced with R and Sn layers, see Figure 1.…”

Section: Introductionmentioning

confidence: 99%

“…These materials belong to the P 6/mmm (#191) space group, where Mn atoms form 2D kagome layers interlaced with R and Sn layers, see Figure 1. Although RMn 6 Sn 6 family of materials has been studied for more than three decades, recent experimental anomalous Hall effect (AHE) studies [1,9,11] inspired a new wave of research [2][3][4][5][6][7][8][12][13][14][15][16]] on related materials.…”

Section: Introductionmentioning

confidence: 99%

The role of electron correlations in the electronic structure of putative Chern magnet TbMn$_6$Sn$_6$ using correlated methods

Annaberdiyev¹,

Mitáš²,

Krogel³

et al. 2023

Preprint

View full text Add to dashboard Cite

A member of the RMn6Sn6 rare-earth family materials, TbMn6Sn6, recently showed experimental signatures of the realization of a quantum-limit Chern magnet. Despite the promising experimental results, theoretical studies with accurate electron correlations which probe these observations have been lacking. In this work, we use quantum Monte Carlo (QMC) and density functional theory with Hubbard U (DFT+U ) calculations to examine the electronic structure of TbMn6Sn6. To do so, we optimize accurate, correlation-consistent pseudopotentials for Tb and Sn using coupled-cluster and configuration-interaction (CI) methods. We find that DFT+U and single-reference QMC calculations suffer from the same overestimation of the magnetic moments as meta-GGA and hybrid density functional approximations. Our findings point to the need for improved orbitals/wavefunctions for this class of materials, such as natural orbitals from CI, or for the inclusion of multi-reference effects that capture the static correlations for an accurate prediction of magnetic properties. The necessity for multi-reference treatment is motivated by extrapolating the dynamic correlations to the exact limit. DFT+U with Mn magnetic moments adjusted to experiment predict the Dirac crossing in bulk to be close to the Fermi level, within ∼ 120 meV, in agreement with the experiments. Our nonstoichiometric slab calculations show that the Dirac crossing approaches even closer to the Fermi level, suggesting the possible realization of Chern magnetism in this limit.

show abstract

Nontrivial spin textures induced remarkable topological Hall effect and extraordinary magnetoresistance in kagome magnet TmMn6Sn6

Liu

Zhang

et al. 2023

Surfaces and Interfaces

View full text Add to dashboard Cite

Low-Temperature Competing Magnetic Energy Scales in the Topological Ferrimagnet TbMn6Sn6

Cited by 23 publications

References 45 publications

Orbital character of the spin-reorientation transition in TbMn$_6$Sn$_6$

Orbital character of the spin-reorientation transition in TbMn$_6$Sn$_6$

The role of electron correlations in the electronic structure of putative Chern magnet TbMn$_6$Sn$_6$ using correlated methods

Nontrivial spin textures induced remarkable topological Hall effect and extraordinary magnetoresistance in kagome magnet TmMn6Sn6

Contact Info

Product

Resources

About