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Evidence for a J(eff)=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7

Davies, NR; Topping, C; Jacobsen, H; Princep, AJ; Kirschner, FKK; Rahn, MC; Bristow, M; ... Boothroyd, AT; + view all (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. Green open access

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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.

Type: Article
Title: Evidence for a J(eff)=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/PhysRevB.99.174442
Publisher version: https://doi.org/10.1103/PhysRevB.99.174442
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Science & Technology, Technology, Physical Sciences, Materials Science, Multidisciplinary, Physics, Applied, Physics, Condensed Matter, Materials Science, Physics, MAGNETIC-SUSCEPTIBILITY, ZERO-FIELD, RELAXATION, SPECTRA
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/10077207
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