# Raman spectroscopy of the low dimensional antiferromagnet with large Neel temperature SrRu2O6

## TL;DR

This study uses Raman spectroscopy to investigate SrRu₂O₆, revealing high Neel temperature, phonon behavior near magnetic transition, and electronic excitations linked to molecular orbital transitions, enhancing understanding of its magnetic properties.

## Contribution

The paper provides the first Raman spectroscopic analysis of SrRu₂O₆, identifying electronic excitations and phonon behavior related to its high Neel temperature and magnetic structure.

## Key findings

- No additional phonon modes at magnetic transition, indicating unchanged symmetry.
- Phonon softening and damping increase near T_N, suggesting electronic continuum interactions.
- A Raman peak at 2050 cm⁻¹ attributed to molecular orbital transitions.

## Abstract

We report results of the Raman measurements for SrRu$_2$O$_6$ having extraordinary high N$\acute{\textrm{e}}$el 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 $T_N$ indicate the appearance of a continuum of interacting electronic excitations at $T\geq300K$. 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 SrRu$_2$O$_6$.