Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice
Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin...
| Main Authors: | , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Language: | English |
| Published: |
American Physical Society
2018
|
| _version_ | 1797081222471483392 |
|---|---|
| author | Sarte, P Cowley, R Rodriguez, E Pachoud, E Le, D García-Sakai, V Taylor, J Frost, C Prabhakaran, D Macewen, C Kitada, A Browne, A Songvilay, M Yamani, Z Buyers, W Attfield, J Stock, C |
| author_facet | Sarte, P Cowley, R Rodriguez, E Pachoud, E Le, D García-Sakai, V Taylor, J Frost, C Prabhakaran, D Macewen, C Kitada, A Browne, A Songvilay, M Yamani, Z Buyers, W Attfield, J Stock, C |
| author_sort | Sarte, P |
| collection | OXFORD |
| description | Neutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180◦ exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t2g channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t2g orbital degeneracy. |
| first_indexed | 2024-03-07T01:11:32Z |
| format | Journal article |
| id | oxford-uuid:8d2bad21-845b-45d8-8aea-3e89348c2399 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T01:11:32Z |
| publishDate | 2018 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | oxford-uuid:8d2bad21-845b-45d8-8aea-3e89348c23992022-03-26T22:49:36ZDisentangling orbital and spin exchange interactions for Co2+ on a rocksalt latticeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:8d2bad21-845b-45d8-8aea-3e89348c2399EnglishSymplectic Elements at OxfordAmerican Physical Society2018Sarte, PCowley, RRodriguez, EPachoud, ELe, DGarcía-Sakai, VTaylor, JFrost, CPrabhakaran, DMacewen, CKitada, ABrowne, ASongvilay, MYamani, ZBuyers, WAttfield, JStock, CNeutron spectroscopy was applied to study the magnetic interactions of orbitally degenerate Co2+ on a host MgO rocksalt lattice where no long-range spin or orbital order exists. The paramagnetic nature of the substituted monoxide Co0.03Mg0.97O allows for the disentanglement of spin exchange and spin-orbit interactions. By considering the prevalent excitations from Co2+ spin pairs, we extract seven exchange constants out to the fourth coordination shell. An antiferromagnetic next-nearest-neighbor 180◦ exchange interaction is dominant; however, dual ferromagnetic and antiferromagnetic interactions are observed for pairings with other pathways. These interactions can be understood in terms of a combination of orbital degeneracy in the t2g channel and the Goodenough-Kanamori-Anderson rules. Our work suggest that such a hierarchy of exchange interactions exists in transition-metal-based oxides with a t2g orbital degeneracy. |
| spellingShingle | Sarte, P Cowley, R Rodriguez, E Pachoud, E Le, D García-Sakai, V Taylor, J Frost, C Prabhakaran, D Macewen, C Kitada, A Browne, A Songvilay, M Yamani, Z Buyers, W Attfield, J Stock, C Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title | Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title_full | Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title_fullStr | Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title_full_unstemmed | Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title_short | Disentangling orbital and spin exchange interactions for Co2+ on a rocksalt lattice |
| title_sort | disentangling orbital and spin exchange interactions for co2 on a rocksalt lattice |
| work_keys_str_mv | AT sartep disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT cowleyr disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT rodrigueze disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT pachoude disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT led disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT garciasakaiv disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT taylorj disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT frostc disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT prabhakarand disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT macewenc disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT kitadaa disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT brownea disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT songvilaym disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT yamaniz disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT buyersw disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT attfieldj disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice AT stockc disentanglingorbitalandspinexchangeinteractionsforco2onarocksaltlattice |