Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6
We report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromagnetic two-leg spin-1/2 ladders. Isolated ladders are expected to have a singlet ground state protected by a spin gap. Ba...
| Main Authors: | , , , , , , , , |
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| Format: | Journal article |
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American Physical Society
2018
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| _version_ | 1826295110846906368 |
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| author | Macdougal, D Gibbs, A Ying, T Wessel, S Walker, H Voneshen, D Mila, F Takagi, H Coldea, R |
| author_facet | Macdougal, D Gibbs, A Ying, T Wessel, S Walker, H Voneshen, D Mila, F Takagi, H Coldea, R |
| author_sort | Macdougal, D |
| collection | OXFORD |
| description | We report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromagnetic two-leg spin-1/2 ladders. Isolated ladders are expected to have a singlet ground state protected by a spin gap. Ba2CuTeO6 orders magnetically, but with a small Neel temperature relative to the exchange strength, suggesting that the interladder couplings are relatively small and only just able to stabilize magnetic order, placing Ba2CuTeO6 close in parameter space to the critical point separating the gapped phase and Neel order. Through comparison of the observed spin dynamics with linear spin wave theory and quantum Monte Carlo calculations, we propose values for all relevant intra- and interladder exchange parameters, which place the system on the ordered side of the phase diagram in proximity to the critical point. We provide further cross-checks of the extracted parameters by comparison with high field magnetization data. |
| first_indexed | 2024-03-07T03:56:04Z |
| format | Journal article |
| id | oxford-uuid:c2e8821f-0f69-40f5-8e29-86c81367d8c3 |
| institution | University of Oxford |
| last_indexed | 2024-03-07T03:56:04Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:c2e8821f-0f69-40f5-8e29-86c81367d8c32022-03-27T06:12:38ZSpin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c2e8821f-0f69-40f5-8e29-86c81367d8c3Symplectic Elements at OxfordAmerican Physical Society2018Macdougal, DGibbs, AYing, TWessel, SWalker, HVoneshen, DMila, FTakagi, HColdea, RWe report inelastic neutron scattering measurements of the magnetic excitations in Ba2CuTeO6, proposed by ab initio calculations to magnetically realize weakly coupled antiferromagnetic two-leg spin-1/2 ladders. Isolated ladders are expected to have a singlet ground state protected by a spin gap. Ba2CuTeO6 orders magnetically, but with a small Neel temperature relative to the exchange strength, suggesting that the interladder couplings are relatively small and only just able to stabilize magnetic order, placing Ba2CuTeO6 close in parameter space to the critical point separating the gapped phase and Neel order. Through comparison of the observed spin dynamics with linear spin wave theory and quantum Monte Carlo calculations, we propose values for all relevant intra- and interladder exchange parameters, which place the system on the ordered side of the phase diagram in proximity to the critical point. We provide further cross-checks of the extracted parameters by comparison with high field magnetization data. |
| spellingShingle | Macdougal, D Gibbs, A Ying, T Wessel, S Walker, H Voneshen, D Mila, F Takagi, H Coldea, R Spin dynamics of coupled spin ladders near quantum criticality in Ba2CuTeO6 |
| title | Spin dynamics of coupled spin ladders near quantum criticality in
Ba2CuTeO6 |
| title_full | Spin dynamics of coupled spin ladders near quantum criticality in
Ba2CuTeO6 |
| title_fullStr | Spin dynamics of coupled spin ladders near quantum criticality in
Ba2CuTeO6 |
| title_full_unstemmed | Spin dynamics of coupled spin ladders near quantum criticality in
Ba2CuTeO6 |
| title_short | Spin dynamics of coupled spin ladders near quantum criticality in
Ba2CuTeO6 |
| title_sort | spin dynamics of coupled spin ladders near quantum criticality in ba2cuteo6 |
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