Sturdy spin-momentum locking in a chiral organic superconductor
Among noncentrosymmetric structures, chirality has recently been recognized as a novel source of asymmetrical charge/spin transports as exemplified by electrical magnetochiral anisotropy (EMChA) and chirality-induced spin selectivity. Although similar bulk-charge rectification and the Rashba-Edelste...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-04-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.7.023056 |
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| _version_ | 1850150885786648576 |
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| author | Takuro Sato Hiroshi Goto Hiroshi M. Yamamoto |
| author_facet | Takuro Sato Hiroshi Goto Hiroshi M. Yamamoto |
| author_sort | Takuro Sato |
| collection | DOAJ |
| description | Among noncentrosymmetric structures, chirality has recently been recognized as a novel source of asymmetrical charge/spin transports as exemplified by electrical magnetochiral anisotropy (EMChA) and chirality-induced spin selectivity. Although similar bulk-charge rectification and the Rashba-Edelstein effect in polar systems are quantitively reproducible by theory based on the electronic band structures, the relevance of band parameters in chiral effects remains elusive. Here, by working with a chiral organic superconductor, we experimentally demonstrate a gigantic EMChA and large superconducting diode effect, both of which are difficult to be explained solely by its band parameters. A two-critical-current signature and an enhanced critical field suggested triplet-mixed Cooper pairs with anomalously enhanced spin-orbit coupling above atomic limit. Our results clearly highlight a unique spin-momentum locking with large stiffness beyond the expectation, suggesting an unknown driving force for spin polarization inherent to chirality. |
| format | Article |
| id | doaj-art-47972826df094b0daa3ec762ce8ee495 |
| institution | OA Journals |
| issn | 2643-1564 |
| language | English |
| publishDate | 2025-04-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj-art-47972826df094b0daa3ec762ce8ee4952025-08-20T02:26:26ZengAmerican Physical SocietyPhysical Review Research2643-15642025-04-017202305610.1103/PhysRevResearch.7.023056Sturdy spin-momentum locking in a chiral organic superconductorTakuro SatoHiroshi GotoHiroshi M. YamamotoAmong noncentrosymmetric structures, chirality has recently been recognized as a novel source of asymmetrical charge/spin transports as exemplified by electrical magnetochiral anisotropy (EMChA) and chirality-induced spin selectivity. Although similar bulk-charge rectification and the Rashba-Edelstein effect in polar systems are quantitively reproducible by theory based on the electronic band structures, the relevance of band parameters in chiral effects remains elusive. Here, by working with a chiral organic superconductor, we experimentally demonstrate a gigantic EMChA and large superconducting diode effect, both of which are difficult to be explained solely by its band parameters. A two-critical-current signature and an enhanced critical field suggested triplet-mixed Cooper pairs with anomalously enhanced spin-orbit coupling above atomic limit. Our results clearly highlight a unique spin-momentum locking with large stiffness beyond the expectation, suggesting an unknown driving force for spin polarization inherent to chirality.http://doi.org/10.1103/PhysRevResearch.7.023056 |
| spellingShingle | Takuro Sato Hiroshi Goto Hiroshi M. Yamamoto Sturdy spin-momentum locking in a chiral organic superconductor Physical Review Research |
| title | Sturdy spin-momentum locking in a chiral organic superconductor |
| title_full | Sturdy spin-momentum locking in a chiral organic superconductor |
| title_fullStr | Sturdy spin-momentum locking in a chiral organic superconductor |
| title_full_unstemmed | Sturdy spin-momentum locking in a chiral organic superconductor |
| title_short | Sturdy spin-momentum locking in a chiral organic superconductor |
| title_sort | sturdy spin momentum locking in a chiral organic superconductor |
| url | http://doi.org/10.1103/PhysRevResearch.7.023056 |
| work_keys_str_mv | AT takurosato sturdyspinmomentumlockinginachiralorganicsuperconductor AT hiroshigoto sturdyspinmomentumlockinginachiralorganicsuperconductor AT hiroshimyamamoto sturdyspinmomentumlockinginachiralorganicsuperconductor |