Raman data indicate that phonons in Nd2Zr2O7 are scattered by crystal-field excitations near 100 K, while lower-energy phonons in semimetallic Nd2Ir2O7 are dominated by electron-phonon scattering.
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Probing scattering of Raman phonons on magnetic and electronic excitations in pyrochlores Nd$_2$Zr$_2$O$_7$ and Nd$_2$Ir$_2$O$_7$
Raman data indicate that phonons in Nd2Zr2O7 are scattered by crystal-field excitations near 100 K, while lower-energy phonons in semimetallic Nd2Ir2O7 are dominated by electron-phonon scattering.