Flat-band spin dynamics and phonon anomalies of the saw-tooth spin-chain system Fe2O(SeO3)2

authored by: V. P. Gnezdilov, Yu G. Pashkevich, V. S. Kurnosov, O. V. Zhuravlev, D. Wulferding, P. Lemmens, D. Menzel, E. S. Kozlyakova, A. Yu Akhrorov, E. S. Kuznetsova, P. S. Berdonosov, V. A. Dolgikh, O. S. Volkova, A. N. Vasiliev
Abstract: Fe3+ S=5/2 ions form saw-tooth-like chains along the a axis of the oxoselenite Fe2O(SeO3)2 and an onset of long-range magnetic order is observed for temperatures below TC=105 K. This order leads to distinct fingerprints in phonon mode linewidths and energies as resolved by Raman scattering. In addition, new excitations with small linewidths emerge below T=150 K, and are assigned to two-magnon scattering processes with the participation of flat-band and high energy magnon branches. From this a set of exchange coupling constants is estimated. The specific ratio of the saw-tooth spine-spine and spine-vertex interactions may explain the instability of the dimer quantum ground state against an incommensurate 3D magnetic order.
External Organisation(s): B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine
Technische Universität Braunschweig
National Academy of Sciences in Ukraine
Lomonosov Moscow State University
National University of Science and Technology MISIS
South Ural State University
Type: Article
Journal: Physical Review B
Volume: 99
ISSN: 2469-9950
Publication date: 12.02.2019
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: Electronic, Optical and Magnetic Materials, Condensed Matter Physics
Electronic version(s): https://doi.org/10.1103/PhysRevB.99.064413 (Access: Unknown)

BibTeX

@article{a1bcd3695f8b4cb693b141dd7a81efb4,
title = "Flat-band spin dynamics and phonon anomalies of the saw-tooth spin-chain system Fe2O(SeO3)2",
abstract = "Fe3+ S=5/2 ions form saw-tooth-like chains along the a axis of the oxoselenite Fe2O(SeO3)2 and an onset of long-range magnetic order is observed for temperatures below TC=105 K. This order leads to distinct fingerprints in phonon mode linewidths and energies as resolved by Raman scattering. In addition, new excitations with small linewidths emerge below T=150 K, and are assigned to two-magnon scattering processes with the participation of flat-band and high energy magnon branches. From this a set of exchange coupling constants is estimated. The specific ratio of the saw-tooth spine-spine and spine-vertex interactions may explain the instability of the dimer quantum ground state against an incommensurate 3D magnetic order.",
author = "Gnezdilov, {V. P.} and Pashkevich, {Yu G.} and Kurnosov, {V. S.} and Zhuravlev, {O. V.} and D. Wulferding and P. Lemmens and D. Menzel and Kozlyakova, {E. S.} and Akhrorov, {A. Yu} and Kuznetsova, {E. S.} and Berdonosov, {P. S.} and Dolgikh, {V. A.} and Volkova, {O. S.} and Vasiliev, {A. N.}",
note = "Funding information: This work has been supported by the Russian Ministry of Education and Science of the Russian Federation through NUST “MISiS” Grant No. K2-2017-084 and by the Act 211 of the Government of Russia, Contracts 02.A03.21.0004 and 02.A03.21.0011. We also want to thank RFBR project 16-03-00463a for the financial support, the “Nieders{\"a}chsisches Vorab” through “Quantum- and Nano-Metrology (QUANOMET)” initiative within the project NL-4, the DFG-LE967/16-1 Project, German Science Foundation, DFG LE967/16-1, and EXC 2123 QuantumFrontiers.",
year = "2019",
month = feb,
day = "12",
doi = "10.1103/PhysRevB.99.064413",
language = "English",
volume = "99",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Institute of Physics",
number = "6",
}