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VOLUME 119 (2024) | ISSUE 7 | PAGE 516
Raman spectroscopy of Na3Co2SbO6
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 \approx 200 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.