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Magnetic materials with pyrochlore crystal structure form exotic magneticstates due to the high lattice frustration. In this work we follow the effectsof coupling of the lattice and electronic and magnetic degrees of freedom intwo Praseodymium-based pyrochlores Pr$_2$Zr$_2$O$_7$ and Pr$_2$Ir$_2$O$_7$. Inboth materials the presence of magnetic interactions does not lead tomagnetically ordered low temperature states, however their electronicproperties are different. A comparison of Raman phonon spectra ofPr$_2$Zr$_2$O$_7$ and Pr$_2$Ir$_2$O$_7$ allows us to identify magneto-elasticcoupling in Pr$_2$Zr$_2$O$_7$ that elucidates its magnetic properties atintermediate temperatures, and allows us to characterize phonon-electroncoupling in the semimetallic Pr$_2$Ir$_2$O$_7$. We also show that the effectsof random disorder on the Raman phonon spectra is small.

Phonon spectrum of Pr$_2$Zr$_2$O$_7$ and Pr$_2$Ir$_2$O$_7$ as an evidence of coupling of the lattice with electronic and magnetic degrees of freedom