• DOI:10.1103/PhysRevB.99.085103
• Corpus ID: 78088519

Raman spectroscopy of the low-dimensional antiferromagnet SrRu2O6 with large Néel temperature

@article{Ponosov2018RamanSO,
  title={Raman spectroscopy of the low-dimensional antiferromagnet 
SrRu2O6
 with large N{\'e}el temperature},
  author={Yu. S. Ponosov and Evgenia V. Komleva and Dmitry A. Zamyatin and Richard I. Walton and Sergey V. Streltsov},
  journal={Physical Review B},
  year={2018}
}

• Y. Ponosov, E. Komleva, +2 authors S. Streltsov
• Published 3 December 2018
• Materials Science
• Physical Review B

We report results of the Raman measurements for ${\mathrm{SrRu}}_{2}{\mathrm{O}}_{6}$ having extraordinary high N\'eel temperature for a layered material. No additional phonon modes were detected at the temperature of magnetic transition thus excluding lowering of the symmetry in the magnetically ordered phase. An unusual increase in softening and damping of some phonons as the temperature approaches ${T}_{N}$ indicates the appearance of a continuum of interacting electronic excitations at $T\ensuremath{\ge}300\phantom{\rule{4.pt}{0ex}}\text{K}$. We also observe an intensive Raman response at 2050 ${\mathrm{cm}}^{\ensuremath{-}1}$. Analysis of the polarization dependence and comparison with available theoretical data shows that this peak likely originates from the transitions between molecular orbitals previously proposed to explain the magnetic properties of ${\mathrm{SrRu}}_{2}{\mathrm{O}}_{6}$. It can be explained by two magnon excitations only if the magnon bandwidth is $\ensuremath{\sim}140$ meV.