Davies, NR; Topping, C; Jacobsen, H; Princep, AJ; Kirschner, FKK; Rahn, MC; Bristow, M; ... Boothroyd, AT; + view all Davies, NR; Topping, C; Jacobsen, H; Princep, AJ; Kirschner, FKK; Rahn, MC; Bristow, M; Vale, JG; da Silva, I; Baker, PJ; Sahle, CJ; Guo, Y-F; Yan, D-Y; Shi, Y-G; Blundell, SJ; McMorrow, DF; Boothroyd, AT; - view fewer (2019) Evidence for a J(eff)=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7. Physical Review B , 99 , Article 174442. 10.1103/PhysRevB.99.174442.

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Abstract

We present AC and DC magnetometry, heat capacity, muon spin relaxation ( μ SR ), and resonant inelastic x-ray scattering (RIXS) studies of the pyrochlore osmate Y 2 Os 2 O 7 . Consistent with previous results, we observe a small Curie-Weiss effective moment of approximately 0.4 μ B and spin freezing at a temperature T f ≃ 5 K . On the other hand, our analysis of the RIXS spectra with single-ion energy-level calculations implies a nonmagnetic J eff = 0 ground state on the Os 4 + sites, with the spin-orbit interaction, Hund's coupling, and trigonal distortion of OsO 6 octahedra, all important in modeling the observed spectra. From high-field magnetization data, we show that the paramagnetic moment is most likely due to large moments μ eff ≃ 3 μ B on only a small fraction f ≃ 0.02 of Os sites. We suggest disorder-related effects, such as oxygen nonstoichiometry or site interchange between Os and Y ions, as the most likely explanation for the magnetic response of this material.

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