Pazmino, E. I.; Feng, S.; Dhakal, R.; Rousochatzakis, I.; Winter, S. M.; Knolle, J.; Tsirlin, A. A. Beyond Kitaev exchange: textbackslashGamma'-driven magnetism in Ag3LiRh2O6 Unpublished (2026), arXiv:2610.19770. @unpublished{pazminoKitaevExchangeGammadriven2026,
title = {Beyond Kitaev exchange: textbackslashGamma'-driven magnetism in Ag_{3}LiRh_{2}O_{6}},
author = {E. I. Pazmino and S. Feng and R. Dhakal and I. Rousochatzakis and S. M. Winter and J. Knolle and A. A. Tsirlin},
url = {https://arxiv.org/abs/2610.19770},
doi = {10.48550/arXiv.2610.19770},
year = {2026},
date = {2026-10-14},
urldate = {2026-10-01},
abstract = {In Kitaev magnets, frustration arises from bond-dependent spin anisotropic interactions, which can potentially realize sought-after quantum spin liquid phases. However, material realizations with dominating Kitaev exchange are scarce and the broad parameter space of extended Kitaev models remains largely unexplored experimentally. Here, we use density-functional theory, cluster many-body, spin-wave, and density-matrix renormalization calculations to show that the recently discovered honeycomb rhodate Ag3LiRh2O6 hosts an off-diagonal exchange Γ′1 that is second in magnitude only to the ferromagnetic Kitaev exchange K1. This combination of K1 and Γ′1 explains key experimental observations, an unusually high magnetic ordering temperature of 94 K at ambient pressure and its rapid decrease under hydrostatic pressure as Ag3LiRh2O6 evolves from ferromagnetic toward zigzag order within the honeycomb planes. Our spin-wave calculations further predict an unusual topology of the magnon bands arising from the Γ′1 term in the spin Hamiltonian of the honeycomb layer. We show that the large trigonal splitting of t2g states enhances Γ′1, the hitherto underappreciated term in Kitaev magnets, and opens the way to new interesting regimes of the extended Kitaev model.},
note = {arXiv:2610.19770},
keywords = {B1, B6},
pubstate = {published},
tppubtype = {unpublished}
}
In Kitaev magnets, frustration arises from bond-dependent spin anisotropic interactions, which can potentially realize sought-after quantum spin liquid phases. However, material realizations with dominating Kitaev exchange are scarce and the broad parameter space of extended Kitaev models remains largely unexplored experimentally. Here, we use density-functional theory, cluster many-body, spin-wave, and density-matrix renormalization calculations to show that the recently discovered honeycomb rhodate Ag3LiRh2O6 hosts an off-diagonal exchange Γ′1 that is second in magnitude only to the ferromagnetic Kitaev exchange K1. This combination of K1 and Γ′1 explains key experimental observations, an unusually high magnetic ordering temperature of 94 K at ambient pressure and its rapid decrease under hydrostatic pressure as Ag3LiRh2O6 evolves from ferromagnetic toward zigzag order within the honeycomb planes. Our spin-wave calculations further predict an unusual topology of the magnon bands arising from the Γ′1 term in the spin Hamiltonian of the honeycomb layer. We show that the large trigonal splitting of t2g states enhances Γ′1, the hitherto underappreciated term in Kitaev magnets, and opens the way to new interesting regimes of the extended Kitaev model. |
Prodan, L.; Evans, D. M.; Puntigam, L.; Kézsmárki, I.; Tsurkan, V. Universality of magnetic susceptibility in the conical state of kagome ferromagnet Fe3Sn2 Journal Article Appl. Phys. Lett. 129, 151905 (2026), datadoi: 10.5281/zenodo.15367272. @article{prodan2026universalitymagneticsusceptibilityconical,
title = {Universality of magnetic susceptibility in the conical state of kagome ferromagnet Fe_{3}Sn_{2}},
author = {L. Prodan and D. M. Evans and L. Puntigam and I. Kézsmárki and V. Tsurkan},
url = {https://doi.org/10.1063/5.0342307},
doi = {10.1063/5.0342307},
year = {2026},
date = {2026-10-13},
urldate = {2026-10-01},
journal = {Appl. Phys. Lett.},
volume = {129},
pages = {151905},
abstract = {We report universal behavior of the differential magnetic susceptibility (DMS) in the conical phase that mediates the spin-reorientation (SR) transition of the kagome ferromagnet Fe3Sn2. Within the SR temperature range, the DMS isotherms exhibit extremely narrow crossing regions, forming isosbestic points. Using an isosbestic-invariance analysis, we show that the isotherms collapse onto a single temperature-independent curve, revealing quadratic-in-temperature corrections to the susceptibility. Complementary field-dependent magnetic-force-microscopy measurements uncover the evolution of spin textures from stripe-like domains at low fields to isolated bubble-like domains near the isosbestic field ( textasciitilde0.6T), a behavior not previously reported in bulk Fe3Sn2 within the conical state. These findings point to a universal mechanism for the emergence of complex magnetic textures near isosbestic points, driven by the competition between magnetocrystalline anisotropy, dipolar interactions, and external magnetic field.},
note = {datadoi: 10.5281/zenodo.15367272},
keywords = {A1, A4},
pubstate = {published},
tppubtype = {article}
}
We report universal behavior of the differential magnetic susceptibility (DMS) in the conical phase that mediates the spin-reorientation (SR) transition of the kagome ferromagnet Fe3Sn2. Within the SR temperature range, the DMS isotherms exhibit extremely narrow crossing regions, forming isosbestic points. Using an isosbestic-invariance analysis, we show that the isotherms collapse onto a single temperature-independent curve, revealing quadratic-in-temperature corrections to the susceptibility. Complementary field-dependent magnetic-force-microscopy measurements uncover the evolution of spin textures from stripe-like domains at low fields to isolated bubble-like domains near the isosbestic field ( textasciitilde0.6T), a behavior not previously reported in bulk Fe3Sn2 within the conical state. These findings point to a universal mechanism for the emergence of complex magnetic textures near isosbestic points, driven by the competition between magnetocrystalline anisotropy, dipolar interactions, and external magnetic field. |
Liu, Y. -J.; Xu, W. -T.; Pollmann, F.; Knap, M. Information-Theoretic Principle of Emergent 1-Form Symmetries Journal Article PRX Quantum 7, (2026), datadoi: 10.5281/zenodo.17652054. @article{liuInformationTheoreticPrincipleEmergent2026,
title = {Information-Theoretic Principle of Emergent 1-Form Symmetries},
author = {Y. -J. Liu and W. -T. Xu and F. Pollmann and M. Knap},
url = {https://doi.org/10.1103/d6qf-5chk},
doi = {10.1103/d6qf-5chk},
issn = {2691-3399},
year = {2026},
date = {2026-10-09},
urldate = {2026-10-01},
journal = {PRX Quantum},
volume = {7},
number = {4},
publisher = {American Physical Society (APS)},
note = {datadoi: 10.5281/zenodo.17652054},
keywords = {C5, C6},
pubstate = {published},
tppubtype = {article}
}
|
