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Article Dans Une Revue Physical Review B Année : 2020

Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate

Résumé

We report neutron diffraction measurements of the magnetic structures in two pyrochlore iridates, Yb2Ir2O7 and Lu2Ir2O7. Both samples exhibit the all-in-all-out magnetic structure on the Ir 4+ sites below TN 150 K, with a low temperature moment of around 0.45 µB/Ir. Below 2 K, the Yb moments in Yb2Ir2O7 begin to order ferromagnetically. However, even at 40 mK the ordered moment is only 0.57(2) µB/Yb, well below the saturated moment of the ground state doublet of Yb 3+ (1.9 µB/Yb), deduced from magnetization measurements and from a refined model of the crystal field environment, and also significantly smaller than the ordered moment of Yb in Yb2Ti2O7 (0.9 µB/Yb). A mean-field analysis shows that the reduced moment on Yb is a consequence of enhanced phase competition caused by coupling to the all-in-all-out magnetic order on the Ir sublattice.
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Dates et versions

hal-03044677 , version 1 (08-12-2020)

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Henrik Jacobsen, Cameron D. Dashwood, Elsa Lhotel, Dmitry Khalyavin, Pascal Manuel, et al.. Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate. Physical Review B, 2020, 101 (10), pp.104404. ⟨10.1103/PhysRevB.101.104404⟩. ⟨hal-03044677⟩

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