Electron spin relaxation of N@C 60 in CS 2
We examine the temperature dependence of the electron spin relaxation times of the molecules N@C 60 and N@C 70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS 2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commo...
| Main Authors: | , , , , , , |
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| Format: | Journal article |
| Language: | English |
| Published: |
2006
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| _version_ | 1797071784622686208 |
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| author | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew, G Briggs, D |
| author_facet | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew, G Briggs, D |
| author_sort | Morton, J |
| collection | OXFORD |
| description | We examine the temperature dependence of the electron spin relaxation times of the molecules N@C 60 and N@C 70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS 2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S≥1 spins in liquid solution, and is the mechanism postulated in the literature for these systems. Instead, we find an Arrhenius temperature dependence for N@C 60, indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C 70 molecule, which has a permanent ZFS, we resolve an additional relaxation mechanism caused by the rapid reorientation of its ZFS. We also report the longest coherence time (T 2) ever observed for a molecular electron spin, being 0.25 ms at 170 K. © 2006 American Institute of Physics. |
| first_indexed | 2024-03-06T22:58:12Z |
| format | Journal article |
| id | oxford-uuid:6127ada9-19c1-413f-b3ae-26c8f15ecafc |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T22:58:12Z |
| publishDate | 2006 |
| record_format | dspace |
| spelling | oxford-uuid:6127ada9-19c1-413f-b3ae-26c8f15ecafc2022-03-26T17:58:00ZElectron spin relaxation of N@C 60 in CS 2 Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:6127ada9-19c1-413f-b3ae-26c8f15ecafcEnglishSymplectic Elements at Oxford2006Morton, JTyryshkin, AArdavan, APorfyrakis, KLyon, SAAndrew, GBriggs, DWe examine the temperature dependence of the electron spin relaxation times of the molecules N@C 60 and N@C 70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS 2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S≥1 spins in liquid solution, and is the mechanism postulated in the literature for these systems. Instead, we find an Arrhenius temperature dependence for N@C 60, indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C 70 molecule, which has a permanent ZFS, we resolve an additional relaxation mechanism caused by the rapid reorientation of its ZFS. We also report the longest coherence time (T 2) ever observed for a molecular electron spin, being 0.25 ms at 170 K. © 2006 American Institute of Physics. |
| spellingShingle | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew, G Briggs, D Electron spin relaxation of N@C 60 in CS 2 |
| title | Electron spin relaxation of N@C 60 in CS 2 |
| title_full | Electron spin relaxation of N@C 60 in CS 2 |
| title_fullStr | Electron spin relaxation of N@C 60 in CS 2 |
| title_full_unstemmed | Electron spin relaxation of N@C 60 in CS 2 |
| title_short | Electron spin relaxation of N@C 60 in CS 2 |
| title_sort | electron spin relaxation of n c 60 in cs 2 |
| work_keys_str_mv | AT mortonj electronspinrelaxationofnc60incs2 AT tyryshkina electronspinrelaxationofnc60incs2 AT ardavana electronspinrelaxationofnc60incs2 AT porfyrakisk electronspinrelaxationofnc60incs2 AT lyonsa electronspinrelaxationofnc60incs2 AT andrewg electronspinrelaxationofnc60incs2 AT briggsd electronspinrelaxationofnc60incs2 |