Magnetic and crystal field excitations in the pyrochlore iridates R2Ir2O7 (R=Yb, Dy, Ho, Gd)
The proposed experiment is part of our systematic experimental studies of the pyrhochlore iridates R2Ir2O7 (R = Rare earth). In these, except for Pr, the Ir-5d electrons exhibit a metal-insulator transition accompanied with a magnetic freezing. This, through f-d exchange, induces an "all-in/all-out" magnetic order of the Tb moments in Tb2Ir2O7. In contrast, the Er moments in Er2Ir2O7 would exhibit spin liquid correlations, suggesting strong relevance of the R3+ magneto-crystalline anisotropy and prompting us to extend our investigations to other species R. We wish here to probe the excitations spectra in Gd2Ir2O7 (where the Gd3+ ions are isotropic), Dy2Ir2O7 and Ho2Ir2O7 (where the Dy3+ and Ho3+ ions should show local easy-axis anisotropy) and Yb2Ir2O7 (where the Yb3+ ions should show local-easy plane anisotropy). A proposal has been submitted on D1B and D4 to determine beforehand the low temperature magnetic phases. It is emphasized that the topic is hot, as a unique example of correlated topological insulators coupled to a possibly frustrated R magnetism, and that it will be harmful to postpone the submission of the inelastic proposal after the elastic experiment.
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LEFRANCOIS Emilie; R. BALLOU; CHAPON Laurent; FAK Bjorn; LHOTEL Elsa; OLLIVIER Jacques and SIMONET Virginie. (2015). Magnetic and crystal field excitations in the pyrochlore iridates R2Ir2O7 (R=Yb, Dy, Ho, Gd). Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1478
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