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| VOLUME 119 (2024) | ISSUE 7 | PAGE 516 |
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Raman spectroscopy of Na3Co2SbO6
Yu. S. Ponosova, E. V. Komlevaa,b, E. A. Pankrushinac,b, D. Mikhailovad, S. V. Streltsova,b
aInstitute of Metal Physics, 620108 Ekaterinburg, Russia bUral Federal University, 620002 Ekaterinburg, Russia cA. N. Zavaritsky Institute of Geology and Geochemistry, Ural Branch of the Russian Academy of Sciences, 620016 Ekaterinburg, Russia dInstitute for Complex Materials, Leibniz Institute for Solid State and Materials Research (IFW) Dresden, 01069 Dresden, Germany
Abstract
Raman spectroscopy together with density functional calculations were used to study lattice dynamics in a layered honeycomb cobaltite Na3Co2SbO6, which can host a field-induced phase related with the Kitaev physics. We show that there develops an additional mode well above Neel temperature (at  K) at 525 cm-1,
which origin can be related to formation of a short-range
magnetic order. Moreover, our theoretical calculations demonstrate that
the highest frequency intensive mode related to the oxygen vibrations is
very sensitive to type of the magnetic order. Thus, we propose to use the
softening of this mode as a hallmark of the transition to a fully
polarized regime, which is stabilized in Kitaev materials in strong
magnetic fields.
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