Electron spin relaxation of N@C60 in CS2 in CS2.
We examine the temperature dependence of the electron spin relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commonly...
Main Authors: | , , , , , |
---|---|
Format: | Journal article |
Language: | English |
Published: |
2006
|
_version_ | 1797100937520611328 |
---|---|
author | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew D Briggs, G |
author_facet | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew D Briggs, G |
author_sort | Morton, J |
collection | OXFORD |
description | We examine the temperature dependence of the electron spin relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S> or =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@C60 , indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C70 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 (T2) ever observed for a molecular electron spin, being 0.25 ms at 170 K. |
first_indexed | 2024-03-07T05:44:48Z |
format | Journal article |
id | oxford-uuid:e6dd374f-68bd-4f8f-b23e-00ce66a8f8d6 |
institution | University of Oxford |
language | English |
last_indexed | 2024-03-07T05:44:48Z |
publishDate | 2006 |
record_format | dspace |
spelling | oxford-uuid:e6dd374f-68bd-4f8f-b23e-00ce66a8f8d62022-03-27T10:33:59ZElectron spin relaxation of N@C60 in CS2 in CS2.Journal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:e6dd374f-68bd-4f8f-b23e-00ce66a8f8d6EnglishSymplectic Elements at Oxford2006Morton, JTyryshkin, AArdavan, APorfyrakis, KLyon, SAAndrew D Briggs, GWe examine the temperature dependence of the electron spin relaxation times of the molecules N@C60 and N@C70 (which comprise atomic nitrogen trapped within a carbon cage) in liquid CS2 solution. The results are inconsistent with the fluctuating zero-field splitting (ZFS) mechanism, which is commonly invoked to explain electron spin relaxation for S> or =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@C60 , indicating the spin relaxation is driven primarily by an Orbach process. For the asymmetric N@C70 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 (T2) ever observed for a molecular electron spin, being 0.25 ms at 170 K. |
spellingShingle | Morton, J Tyryshkin, A Ardavan, A Porfyrakis, K Lyon, SA Andrew D Briggs, G Electron spin relaxation of N@C60 in CS2 in CS2. |
title | Electron spin relaxation of N@C60 in CS2 in CS2. |
title_full | Electron spin relaxation of N@C60 in CS2 in CS2. |
title_fullStr | Electron spin relaxation of N@C60 in CS2 in CS2. |
title_full_unstemmed | Electron spin relaxation of N@C60 in CS2 in CS2. |
title_short | Electron spin relaxation of N@C60 in CS2 in CS2. |
title_sort | electron spin relaxation of n c60 in cs2 in cs2 |
work_keys_str_mv | AT mortonj electronspinrelaxationofnc60incs2incs2 AT tyryshkina electronspinrelaxationofnc60incs2incs2 AT ardavana electronspinrelaxationofnc60incs2incs2 AT porfyrakisk electronspinrelaxationofnc60incs2incs2 AT lyonsa electronspinrelaxationofnc60incs2incs2 AT andrewdbriggsg electronspinrelaxationofnc60incs2incs2 |