Zhang, Y. -S.; Isobe, M.; Takagi, H.; Huang, D. Electronic tuning of the soft-phonon transport anomaly in Ta2Ni(SxSe1-x)5 Journal Article Phys. Rev. Lett. 137, 106503 (2026). @article{l5xq-2yrt,
title = {Electronic tuning of the soft-phonon transport anomaly in Ta_{2}Ni(S_{x}Se_{1-x})_{5}},
author = {Y. -S. Zhang and M. Isobe and H. Takagi and D. Huang},
url = {https://link.aps.org/doi/10.1103/l5xq-2yrt},
doi = {10.1103/l5xq-2yrt},
year = {2026},
date = {2026-09-02},
urldate = {2026-09-01},
journal = {Phys. Rev. Lett.},
volume = {137},
number = {10},
pages = {106503},
abstract = {Ta2NiSe5 continues to be investigated for its phase transition at 𝑇c=326 K, where it develops both an electronic gap and a distortion of its Ta/Ni chains. One intriguing feature at 𝑇c seen in thermal transport is the giant anisotropic scattering of phonons moving perpendicular to the chains, which is apparently associated with the softening of a transverse acoustic phonon, but whose microscopic origin and significance demand clarification. By tuning the normal-state band overlap or gap with S substitution, we uncover a close connection between this soft-phonon transport anomaly and underlying electronic instabilities: when Ta2Ni(S𝑥Se1−𝑥)5 approaches a band insulator at high 𝑥, and signatures of the electronic transition are suppressed, the soft-phonon transport anomaly concomitantly vanishes. Our results establish the following picture for the Ta2Ni(S𝑥Se1−𝑥)5 family: near the S end, a sole lattice instability gives rise to a weak structural transition with 𝑇c approaching 130 K. Near the Se end, additional electronic instabilities boost 𝑇c up to 326 K and amplify experimental signatures of the transition. The strong interaction between electrons, holes, and the lattice is manifested as a soft-phonon transport anomaly accompanied by electronic fluctuations, which include excitonic and hybridization-gap fluctuations.},
keywords = {A3},
pubstate = {published},
tppubtype = {article}
}
Ta2NiSe5 continues to be investigated for its phase transition at 𝑇c=326 K, where it develops both an electronic gap and a distortion of its Ta/Ni chains. One intriguing feature at 𝑇c seen in thermal transport is the giant anisotropic scattering of phonons moving perpendicular to the chains, which is apparently associated with the softening of a transverse acoustic phonon, but whose microscopic origin and significance demand clarification. By tuning the normal-state band overlap or gap with S substitution, we uncover a close connection between this soft-phonon transport anomaly and underlying electronic instabilities: when Ta2Ni(S𝑥Se1−𝑥)5 approaches a band insulator at high 𝑥, and signatures of the electronic transition are suppressed, the soft-phonon transport anomaly concomitantly vanishes. Our results establish the following picture for the Ta2Ni(S𝑥Se1−𝑥)5 family: near the S end, a sole lattice instability gives rise to a weak structural transition with 𝑇c approaching 130 K. Near the Se end, additional electronic instabilities boost 𝑇c up to 326 K and amplify experimental signatures of the transition. The strong interaction between electrons, holes, and the lattice is manifested as a soft-phonon transport anomaly accompanied by electronic fluctuations, which include excitonic and hybridization-gap fluctuations. |
Schilberth, F.; Vasin, K.; Knauft, M.; Kondákor, M.; Vuckovic, M.; Herrmann, N.; Penc, K.; Minola, M.; Keimer, B.; Martinez, V. A.; Panda, K.; Sirenko, A. A.; Prodan, L.; Tsurkan, V.; Tsirlin, A. A.; Kézsmárki, I.; Deisenhofer, J. Magnetic circular dichroism of THz modes and selection rules of Raman-active optical phonons in the polar altermagnet candidate Mn2Mo3O8 Unpublished (2026), arXiv:2608.01062. @unpublished{schilberth_magnetic_2026,
title = {Magnetic circular dichroism of THz modes and selection rules of Raman-active optical phonons in the polar altermagnet candidate Mn_{2}Mo_{3}O_{8}},
author = {F. Schilberth and K. Vasin and M. Knauft and M. Kondákor and M. Vuckovic and N. Herrmann and K. Penc and M. Minola and B. Keimer and V. A. Martinez and K. Panda and A. A. Sirenko and L. Prodan and V. Tsurkan and A. A. Tsirlin and I. Kézsmárki and J. Deisenhofer},
url = {https://arxiv.org/abs/2608.01062},
doi = {10.48550/arXiv.2608.01062},
year = {2026},
date = {2026-08-02},
urldate = {2026-08-01},
note = {arXiv:2608.01062},
keywords = {A1, B2, B3, C4},
pubstate = {published},
tppubtype = {unpublished}
}
|
Gippius, A. A.; Zhurenko, S. V.; Tkachev, A. V.; Gunbin, A. V.; Büttgen, N.; Schaedler, M.; Silkin, I. G.; Morozov, I. V.; Bogach, A. V.; Sobolev, A. V.; Presniakov, I. A.; Moskvin, A. S. Short-range helical magnetic order in FeP1-xAsx (x = 0.33 and 0.5) Journal Article J. Magn. Magn. Mater. 651, 174177 (2026). @article{GIPPIUS2026174177,
title = {Short-range helical magnetic order in FeP_{1-x}As_{x} (x = 0.33 and 0.5)},
author = {A. A. Gippius and S. V. Zhurenko and A. V. Tkachev and A. V. Gunbin and N. Büttgen and M. Schaedler and I. G. Silkin and I. V. Morozov and A. V. Bogach and A. V. Sobolev and I. A. Presniakov and A. S. Moskvin},
url = {https://www.sciencedirect.com/science/article/pii/S0304885326003689},
doi = {10.1016/j.jmmm.2026.174177},
year = {2026},
date = {2026-08-01},
urldate = {2026-08-01},
journal = {J. Magn. Magn. Mater.},
volume = {651},
pages = {174177},
abstract = {Although the FeP1-xAsx solid solution compounds are isostructural with the binary helimagnets FeP and FeAs with MnP-type structure (sp. gr. Pnma) of the B31 family, their magnetic structure remained unclear. We studied two members of this family (x = 0.33 and 0.5) via microscopic site-selective techniques such as Mössbauer and NMR spectroscopy. Our results indicate that the helimagnetic nature of the ground state is preserved, but undergoes significant modifications. In particular, its ordering range seems to become drastically shorter, so that the local fields on the non-magnetic phosphorus atoms decrease several times compared to those in FeP, and even local fields on iron slightly decrease compared to FeP and FeAs. The ordering temperature for these fragmented structures is suppressed down to 20–30 K, which is significantly lower than the TN values for FeP and FeAs. Additionally, both compounds demonstrate higher sustainability to the external field than the parent compound FeP.},
keywords = {B4},
pubstate = {published},
tppubtype = {article}
}
Although the FeP1-xAsx solid solution compounds are isostructural with the binary helimagnets FeP and FeAs with MnP-type structure (sp. gr. Pnma) of the B31 family, their magnetic structure remained unclear. We studied two members of this family (x = 0.33 and 0.5) via microscopic site-selective techniques such as Mössbauer and NMR spectroscopy. Our results indicate that the helimagnetic nature of the ground state is preserved, but undergoes significant modifications. In particular, its ordering range seems to become drastically shorter, so that the local fields on the non-magnetic phosphorus atoms decrease several times compared to those in FeP, and even local fields on iron slightly decrease compared to FeP and FeAs. The ordering temperature for these fragmented structures is suppressed down to 20–30 K, which is significantly lower than the TN values for FeP and FeAs. Additionally, both compounds demonstrate higher sustainability to the external field than the parent compound FeP. |
