Magnetic and structural correlations in the warwickite Mn<sub>2</sub>OBO<sub>3</sub>

Magnetic and structural correlations in the warwickite Mn₂OBO₃

V. Gnezdilov^1,2, Yu. Pashkevich³, V. Kurnosov¹, O.V. Zhuravlev³, D. Wulferding², P. Lemmens², N.V. Kazak⁴, Yu.V. Knyazev⁴, and S.G. Ovchinnikov^4,5

¹B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Nauki Ave., Kharkiv 61103, Ukraine
E-mail: gnezdilov@ilt.kharkov.ua

²Institute for Condensed Matter Physics, TU Braunschweig, Braunschweig D-38106, Germany

³O.O. Galkin Donetsk Institute for Physics and Engineering of the National Academy of Sciences of Ukraine 46 Nauki Ave., Kyiv 03680, Ukraine

⁴Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk 660036, Russia

⁵School of Engineering Physics and Radio Electronics, Siberian Federal University, Krasnoyarsk 660041, Russia

Received April 16, 2019, published online July 26, 2019

We report a Raman scattering study of single-crystalline homometallic oxyborate Mn₂OBO₃, a compound realizing a one-dimensional ribbon-structure. Phonon excitations as a function of temperature and light polarization are compared to lattice dynamical calculations, giving evidence for a strong coupling between lattice and magnetic degrees of freedom. Furthermore, a broader feature with a distinct structure emerges at low temperatures. Based on our theoretical analysis, we assign this signal to specific two-magnon scattering processes related to high energy flat-band magnon branches.

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Magnetic and structural correlations in the warwickite Mn2OBO3

Magnetic and structural correlations in the warwickite Mn₂OBO₃