Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra
As charge carriers traverse a single superconductor ferromagnet interface, they experience an additional spin-dependent phase angle that results in spin mixing and the formation of a bound state called the Andreev bound state. Here we explore whether point contact Andreev reflection can be used to d...
| Main Authors: | , , , , , , |
|---|---|
| 格式: | Journal article |
| 出版: |
American Physical Society
2017
|
| _version_ | 1826263045335154688 |
|---|---|
| author | Yates, K Olde Olthof, L Vickers, M Prabhakaran, D Egilmez, M Robinson, J Cohen, L |
| author_facet | Yates, K Olde Olthof, L Vickers, M Prabhakaran, D Egilmez, M Robinson, J Cohen, L |
| author_sort | Yates, K |
| collection | OXFORD |
| description | As charge carriers traverse a single superconductor ferromagnet interface, they experience an additional spin-dependent phase angle that results in spin mixing and the formation of a bound state called the Andreev bound state. Here we explore whether point contact Andreev reflection can be used to detect the Andreev bound state and, within the limits of our experiment, we extract the resulting spin mixing angle. By examining spectra taken from La1.15Sr1.85Mn2O7-Pb junctions, together with a compilation of literature data on highly spin polarized systems, we suggest that the existence of the Andreev bound state would resolve a number of long standing controversies in the literature of Andreev reflection, as well as defining a route to quantify the strength of spin mixing at superconductor-ferromagnet interfaces. Intriguingly, we find that for high transparency junctions, the spin mixing angle appears to take a relatively narrow range of values across all the samples studied. The ferromagnets we have cho sen to study share a common property in terms of their spin arrangement, and our observations may point to the importance of this property in determining the spin mixing angle under these circumstances. |
| first_indexed | 2024-03-06T19:45:27Z |
| format | Journal article |
| id | oxford-uuid:22256aca-2bf6-44db-a28c-e5c97f997ddd |
| institution | University of Oxford |
| last_indexed | 2024-03-06T19:45:27Z |
| publishDate | 2017 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:22256aca-2bf6-44db-a28c-e5c97f997ddd2022-03-26T11:37:11ZAndreev bound states in superconductor/ferromagnet point contact Andreev reflection spectraJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:22256aca-2bf6-44db-a28c-e5c97f997dddSymplectic Elements at OxfordAmerican Physical Society2017Yates, KOlde Olthof, LVickers, MPrabhakaran, DEgilmez, MRobinson, JCohen, LAs charge carriers traverse a single superconductor ferromagnet interface, they experience an additional spin-dependent phase angle that results in spin mixing and the formation of a bound state called the Andreev bound state. Here we explore whether point contact Andreev reflection can be used to detect the Andreev bound state and, within the limits of our experiment, we extract the resulting spin mixing angle. By examining spectra taken from La1.15Sr1.85Mn2O7-Pb junctions, together with a compilation of literature data on highly spin polarized systems, we suggest that the existence of the Andreev bound state would resolve a number of long standing controversies in the literature of Andreev reflection, as well as defining a route to quantify the strength of spin mixing at superconductor-ferromagnet interfaces. Intriguingly, we find that for high transparency junctions, the spin mixing angle appears to take a relatively narrow range of values across all the samples studied. The ferromagnets we have cho sen to study share a common property in terms of their spin arrangement, and our observations may point to the importance of this property in determining the spin mixing angle under these circumstances. |
| spellingShingle | Yates, K Olde Olthof, L Vickers, M Prabhakaran, D Egilmez, M Robinson, J Cohen, L Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title | Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title_full | Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title_fullStr | Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title_full_unstemmed | Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title_short | Andreev bound states in superconductor/ferromagnet point contact Andreev reflection spectra |
| title_sort | andreev bound states in superconductor ferromagnet point contact andreev reflection spectra |
| work_keys_str_mv | AT yatesk andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT oldeolthofl andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT vickersm andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT prabhakarand andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT egilmezm andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT robinsonj andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra AT cohenl andreevboundstatesinsuperconductorferromagnetpointcontactandreevreflectionspectra |