Jacobsen, H; Dashwood, CD; Lhotel, E; Khalyavin, D; Manuel, P; Stewart, R; Prabhakaran, D; ... Boothroyd, AT; + view all Jacobsen, H; Dashwood, CD; Lhotel, E; Khalyavin, D; Manuel, P; Stewart, R; Prabhakaran, D; McMorrow, DF; Boothroyd, AT; - view fewer (2020) Strong quantum fluctuations from competition between magnetic phases in a pyrochlore iridate. Physical Review B , 101 (10) , Article 104404. 10.1103/PhysRevB.101.104404.

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Abstract

We report neutron diffraction measurements of the magnetic structures in two pyrochlore iridates, Yb 2 Ir 2 O 7 and Lu 2 Ir 2 O 7 . Both samples exhibit the all-in-all-out magnetic structure on the Ir 4 + sites below T N ≃ 150 K, with a low temperature moment of around 0. 45 μ B /Ir. Below 2 K, the Yb moments in Yb 2 Ir 2 O 7 begin to order ferromagnetically. However, even at 40 mK the ordered moment is only 0.57(2) μ B /Yb, well below the saturated moment of the ground state doublet of Yb 3 + (1. 9 μ B /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 Yb 2 Ti 2 O 7 (0. 9 μ B /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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