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Phase transitions with lowering temperature is a manifestation of decreasedentropy and within the Landau theoretical framework these are accompanied bythe symmetry breaking. Whenever a symmetry is broken weakly or strongly, itleaves its trail and the same may be captured indirectly using renormalizationof the quasi-particle excitations. Cr2Ge2Te6, a quasi-two-dimensional magneticmaterial, provides a rich playground to probe dynamics of the quasi-particleexcitations as well as multiple phase transitions with lowering temperatureintimately linked with the lattice and spin degrees of freedom. Here, we reportin-depth inelastic light scattering measurements on single crystals ofCr2Ge2Te6 as a function of temperature, from 6 K to 330 K, and polarization.Our measurements reveal the long as well as short range ordering of the spinsbelow Tc (~ 60 K) and T* (~ 180 K), respectively; setting the stage for brokenrotational and time reversal symmetry, gauged via the distinct renormalizationof the phonon self-energy parameters along with the modes intensity. Ourmeasurements also uncovered an intriguing dependence of the interactionstrength between discrete state (phonon here) and the underlying continuum,quantified using the Fano asymmetry parameter, as a function of the scatteredlight polarization. Our results suggest the possibility of tuning theinteraction strength using controlled scattered light and symmetry in this 2Dmagnet.

Broken weak and strong spin rotational symmetries and tunable interaction between phonon and the continuum in Cr2Ge2Te6