Phonon spectrum of Pr2Zr2O7 and Pr2Ir2O7 as an evidence of coupling of the lattice with electronic and magnetic degrees of freedom
Abstract
Magnetic materials with pyrochlore crystal structure form exotic magnetic states due to the high lattice frustration. In this work we follow the effects of coupling of the lattice and electronic and magnetic degrees of freedom in two Praseodymium-based pyrochlores Pr2Zr2O7 and Pr2Ir2O7. In both materials the presence of magnetic interactions does not lead to magnetically ordered low temperature states, however their electronic properties are different. A comparison of Raman phonon spectra of Pr2Zr2O7 and Pr2Ir2O7 allows us to identify magneto-elastic coupling in Pr2Zr2O7 that elucidates its magnetic properties at intermediate temperatures, and allows us to characterize phonon-electron coupling in the semimetallic Pr2Ir2O7. We also show that the effects of random disorder on the Raman phonon spectra is small.
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