We report results of the Raman measurements for SrRu2O6 having extraordinary high Neˊel 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 TN indicate the appearance of a continuum of interacting electronic excitations at T≥300K. We also observe an intensive Raman response at 2050 cm−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 SrRu2O6.
@article{arxiv.1812.00560,
title = {Raman spectroscopy of the low dimensional antiferromagnet with large Neel temperature SrRu2O6},
author = {Yu. S. Ponosov and E. V. Komleva and D. A. Zamyatin and R. I. Walton and S. V. Streltsov},
journal= {arXiv preprint arXiv:1812.00560},
year = {2019}
}