Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures
“Hidden”-order phases with high-rank multipolar order parameters have been recently detected in several cubic double perovskites of 5d transition metals. Here, by constructing and solving an ab initio low-energy Hamiltonian, we show that an antiferroic order of magnetic octupoles also forms in the t...
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American Physical Society
2025-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/tvp5-mpy9 |
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| author | Dario Fiore Mosca Leonid V. Pourovskii |
| author_facet | Dario Fiore Mosca Leonid V. Pourovskii |
| author_sort | Dario Fiore Mosca |
| collection | DOAJ |
| description | “Hidden”-order phases with high-rank multipolar order parameters have been recently detected in several cubic double perovskites of 5d transition metals. Here, by constructing and solving an ab initio low-energy Hamiltonian, we show that an antiferroic order of magnetic octupoles also forms in the tetragonal 5d^{1} double perovskite Sr_{2}MgReO_{6}. The low-temperature order in this material is determined by a tetragonal crystal field dominating over exchange interactions. This results in a well isolated crystal-field doublet ground state hosting octupolar low-energy degrees of freedom. Very weak dipole moments entangled with the primary octupole order parameters are induced by admixture of the excited j1/2 spin-orbit multiplet. We show that the octupolar order leads to characteristic quasigapless magnetic excitation spectra, as well as to the intensity of superstructural neutron diffraction reflexes peaking at large scattering momenta. |
| format | Article |
| id | doaj-art-b444efb4af8545c0abc08abab54abef3 |
| institution | DOAJ |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-b444efb4af8545c0abc08abab54abef32025-08-20T03:11:51ZengAmerican Physical SocietyPhysical Review Research2643-15642025-07-0173L03201610.1103/tvp5-mpy9Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signaturesDario Fiore MoscaLeonid V. Pourovskii“Hidden”-order phases with high-rank multipolar order parameters have been recently detected in several cubic double perovskites of 5d transition metals. Here, by constructing and solving an ab initio low-energy Hamiltonian, we show that an antiferroic order of magnetic octupoles also forms in the tetragonal 5d^{1} double perovskite Sr_{2}MgReO_{6}. The low-temperature order in this material is determined by a tetragonal crystal field dominating over exchange interactions. This results in a well isolated crystal-field doublet ground state hosting octupolar low-energy degrees of freedom. Very weak dipole moments entangled with the primary octupole order parameters are induced by admixture of the excited j1/2 spin-orbit multiplet. We show that the octupolar order leads to characteristic quasigapless magnetic excitation spectra, as well as to the intensity of superstructural neutron diffraction reflexes peaking at large scattering momenta.http://doi.org/10.1103/tvp5-mpy9 |
| spellingShingle | Dario Fiore Mosca Leonid V. Pourovskii Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures Physical Review Research |
| title | Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures |
| title_full | Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures |
| title_fullStr | Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures |
| title_full_unstemmed | Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures |
| title_short | Antiferro octupolar order in the 5d^{1} double perovskite Sr_{2}MgReO_{6} and its spectroscopic signatures |
| title_sort | antiferro octupolar order in the 5d 1 double perovskite sr 2 mgreo 6 and its spectroscopic signatures |
| url | http://doi.org/10.1103/tvp5-mpy9 |
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