Magnetic moment fragmentation in (NdLa)2Zr2O7 pyrochlore magnets
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 all-in all-out ordering (Bragg peaks) coexist. In order to understand this phenomenon, we study doped Nd2Zr2O7 compounds by substituting non-magnetic ion La3+ on the Nd3+ site. We expect this substitution to affect directly the all-in all-out order. Their magnetic structure has been determined by experiments at the LLB on the G4.1 powder diffractomer. Despite a doping of x=10% and 20% of the Nd3+ magnetic ions, the all-in all-out ordering persists and, in addition, the ordered magnetic moment increases with the doping rate. To probe the role of disorder on the magnetic state of the Nd3+ ions and to determine the associated crystal electric field (CEF) Hamiltonian, we propose to measure the CEF excitations on PANTHER and IN6 on two powder compounds, [Nd(1-x)Lax]2Zr2O7 with x=0.1 and 0.2.
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LEGER Melanie; FAK Bjorn; LHOTEL Elsa; PETIT Sylvain and ZANOTTI Jean-Marc. (2021). Magnetic moment fragmentation in (NdLa)2Zr2O7 pyrochlore magnets. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-779
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