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Pr$_2$Zr$_2$O$_7$ is a pyrochlore quantum spin-ice candidate. Using Ramanscattering spectroscopy we probe crystal electric field excitations ofPr$^{3+}$, and demonstrate the importance of their interactions with thelattice. We identify a vibronic interaction with a phonon that leads to asplitting of a doublet crystal field excitation at around 55~meV. We also probea splitting of the non-Kramers ground state doublet of Pr$^{3+}$ by observing adouble line of the excitations to the first excited singlet state $E^0_g\rightarrow A_{1g}$. We show that the splitting has a strong temperaturedependence, with the doublet structure most prominent between 50~K and 100~K,and the weight of one of the components strongly decreases on cooling. Wesuggest a static or dynamic deviation of Pr$^{3+}$ from the position in theideal crystal structure can be the origin of the effect, with the deviationstrongly decreasing at low temperatures.

Importance of dynamic lattice effects for crystal field excitations in quantum spin ice candidate Pr$_2$Zr$_2$O$_7$