Determination of the local ordered moment in Nd2Zr2O7
In the pyrochlore compound Nd2Zr2O7, a peculiar magnetic state has been observed through elastic and inelastic neutron scattering measurements: a dynamic fragmented phase where spin-ice features (pinch point pattern) and a partial antiferromagnetic ordering along the local z directions (Bragg peaks) coexist. It has been proposed by O.Benton that this state can be understood as a totally ordered state but whose one component remains hidden to conventional experimental probes. In order to test this scenario, we propose to probe the local ordered Nd electronic moment on IN16b by measuring the excitations resulting from the hyperfine splitting of the nuclear Nd moment. This will allows us to access directly the static component of the Nd electronic moment aligned along z, and thus to compare it with Benton's scenario. In addition, the width of the excitations provides strong insight on the distribution of these locally ordered moments. We thus plan to measure two powder compounds, the pure one Nd2Zr2O7 and a doped one [Nd0.6La0.4]2Zr2O7, where preliminary measurements have shown that the partial antiferromagnetic ordering persists, in spite of the strong amount of disorder.
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LEGER Melanie; APPEL Markus; LHOTEL Elsa and PETIT Sylvain. (2020). Determination of the local ordered moment in Nd2Zr2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-778
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