Probing scattering of Raman phonons on magnetic and electronic excitations in pyrochlores Nd2Zr2O7 and Nd2Ir2O7
Abstract
Magnetic rare earth atoms on pyrochlore lattice can produce such exotic magnetic states as spin ice and quantum spin ice. These states are a result of the frustration in the pyrochlore lattice, as well as crystal field degrees of freedom of rare earth atoms, and their interactions with the lattice. Raman scattering spectroscopy, which possess high spectral resolution and can easily access broad energy and temperature ranges, is an optimum tool to study these excitations and their interactions. In this work we follow Raman scattering of zone center phonons and crystal field excitations of Nd3+ in Nd2Zr2O7 and Nd2Ir2O7 in the temperature range where these materials are paramagnetic. A comparison between an insulating Nd2Zr2O7 and semimetallic Nd2Ir2O7 materials allow us to distinguish between scattering of phonons on other phonons, crystal field excitations, and electrons, highlighting interactions between these degrees of freedom.
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