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...

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Main Authors: Morton, J, Tyryshkin, A, Ardavan, A, Porfyrakis, K, Lyon, SA, Andrew D Briggs, G
Format: Journal article
Language:English
Published: 2006
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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.
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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