Fig. 1: Temperature dependence of magnetic modes.
From: Collective magnetic Higgs excitation in a pyrochlore ruthenate
a, b Bose-corrected Raman intensity (Imχ) measured at 5 K (blue curve) and 300 K (red curve) in the A1g+T2g (ein = eout = [110]) and the Eg (\({{{{\bf{e}}}}}_{{{{\rm{in}}}}}=[110],{{{{\bf{e}}}}}_{{{{\rm{out}}}}}=[\bar{1}10]\)) symmetry channels, respectively. Arrows mark the T2g phonon a and the Eg phonon b. The insets plot the angular dependent intensity of excitation A at 5 K in parallel and crossed polarization. c Color contour plot of the temperature dependence in Eg symmetry. Note that the Raman shift is shown on a logarithmic scale to emphasize low lying excitations. Square symbols trace the evolution of excitation A. The dashed lines mark TN and T*. d Raman spectra measured in Eg symmetry at selected temperatures through TN (full circles). The emergent quasi-elastic scattering (QES) and excitation A are shaded. e–g Temperature dependence of the energy, linewidth, and intensity of the low-energy excitation A (red squares) together with the one-magnon excitation at 25 meV (pale green diamonds). The solid red curve is a mean-field fit to the energy (see text for details). The blue circles in g show the intensity of quasi-elastic scattering. The dashed green line marks TN. Error bars in e–g indicate ± 1 standard deviation around the mean value.
