Strong quantum fluctuations due to competition between magnetic phases in a pyrochlore iridate

Abstract

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 Ir4+ sites below TN~ 150,K, with a low temperature moment of around 0.45 muB/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(3)muB/Yb, well below the saturated moment of the ground state doublet of Yb3+ (1.9 muB/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 muB/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.

arXiv comment14 pages, 10 figures, resubmitted to PRB

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• The magnetic behaviour of Dy${}_2$Ir${}_2$O${}_7$ -- beyond the mean field approximation
• Magnetically induced metal-insulator transition in Pb2CaOsO6
• 2-Form U(1) Spin Liquids: Classical Model and Quantum Aspects