Raman scattering from Higgs mode oscillations in the two-dimensional antiferromagnet Ca${}_2$RuO${}_4$

Sofia-Michaela Souliou, Jiří Chaloupka, Giniyat Khaliullin +5

We present and analyze Raman spectra of the Mott insulator Ca${}_2$RuO${}_4$, whose quasi-two-dimensional antiferromagnetic order has been described as a condensate of low-lying spin-o…