Strong coupling of lattice and orbital excitations in quantum magnet Ca${}_{10}$Cr${}_7$O${}_{28}$: Anomalous temperature dependence of Raman phonons

Srishti Pal, Arnab Seth, Anzar Ali +4

We report low-temperature Raman signatures of the Heisenberg quantum magnet Ca${}_{10}$Cr${}_7$O${}_{28}$, showing clear anomalies in phonon mode frequencies and linewidths below $\sim$1…