Er magnetism in the Iridate Pyrochlore Er2Ir2O7
The Ir-5d electrons in most iridate pyrochlores R2Ir2O7 (R = Y, Rare Earth), except Pr2Ir2O7, exhibit a metal-insulator transition accompanied with a magnetic freezing at temperature ranging from 35 K in Nd2Ir2O7 to 155 K in Y2Ir2O7. This magnetic freezing induces an "all-in all-out" magnetic order of the R moments around 15 K in Nd2Ir2O7 and 20 K in Tb2Ir2O7 through the f-d exchange. In contrast, no Er magnetic order is detected by neutron diffraction in Er2Ir2O7 down to 2K. We understand this by modelling the Nd or Tb magnetism with multi-axial Ising spins (aligned along the <111> directions) and the Er magnetism with multi-planar XY spins (perpendicular to these directions). We however observed additional hysteresis features in recent thermomagnetic measurements at around 0.6 K. We shall therefore request 5 days beam time on D7 with a dilution fridge to check whether the low temperature magnetization processes accounts for Er magnetic freezing or has still to do with the Ir magnetism.
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LEFRANCOIS Emilie; R. BALLOU; CHAPON Laurent; LEJAY Pascal; LHOTEL Elsa; NILSEN Goran and SIMONET Virginie. (2014). Er magnetism in the Iridate Pyrochlore Er2Ir2O7. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-53-244
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