Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7
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 temp...
| Main Authors: | , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2019
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| _version_ | 1797083293754064896 |
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| author | 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 |
| author_facet | 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 |
| author_sort | Davies, N |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-07T01:39:42Z |
| format | Journal article |
| id | oxford-uuid:966f16cf-18e0-4b82-adb1-f07ad58462d0 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:39:42Z |
| publishDate | 2019 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:966f16cf-18e0-4b82-adb1-f07ad58462d02022-03-26T23:52:53ZEvidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:966f16cf-18e0-4b82-adb1-f07ad58462d0EnglishSymplectic Elements at OxfordAmerican Physical Society2019Davies, NTopping, CJacobsen, HPrincep, AKirschner, FRahn, MBristow, MVale, JDa Silva, IBaker, PSahle, CGuo, YYan, DShi, YBlundell, SMcMorrow, DBoothroyd, AWe 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. |
| spellingShingle | 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 Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title | Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title_full | Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title_fullStr | Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title_full_unstemmed | Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title_short | Evidence for a Jeff=0 ground state and defect-induced spin glass behavior in the pyrochlore osmate Y2Os2O7 |
| title_sort | evidence for a jeff 0 ground state and defect induced spin glass behavior in the pyrochlore osmate y2os2o7 |
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