Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7
| Autor: | Davies, N, Topping, C, Jacobsen, H, Princep, A, Kirschner, F, Rahn, M, Bristow, M, Vale, J, Da Silva, I, Baker, P, Sahle, C, Guo, Y, Yan, D, Shi, Y, Blundell, S, McMorrow, D, Boothroyd, A |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review B. 99(17) |
| ISSN: | 2469-9969 2469-9950 |
| Popis: | We present AC and DC magnetometry, heat capacity, muon spin relaxation (μSR), and resonant inelastic x-ray scattering (RIXS) studies of the pyrochlore osmate Y2Os2O7. Consistent with previous results, we observe a small Curie-Weiss effective moment of approximately 0.4 μB and spin freezing at a temperature Tf≃5K. On the other hand, our analysis of the RIXS spectra with single-ion energy-level calculations implies a nonmagnetic Jeff=0 ground state on the Os4+ sites, with the spin-orbit interaction, Hund's coupling, and trigonal distortion of OsO6 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 μeff≃3μB 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. |
| Databáze: | OpenAIRE |
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