Conduction mechanism of nitronyl-nitroxide molecular magnetic compounds
(2016) In Physical Review B (Condensed Matter and Materials Physics) 93(16).- Abstract
We investigate the conduction mechanisms of nitronyl-nitroxide (NIT) molecular radicals, as useful for the creation of nanoscopic molecular spintronic devices, finding that it does not correspond to standard Mott behavior, as previously postulated. We provide a complete investigation using transport measurements, low-energy, sub-THz spectroscopy and introducing differently substituted phenyl appendages. We show that a nontrivial surface-charge-limited regime is present in addition to the standard low-voltage Ohmic conductance. Scaling analysis allows one to determine all the main transport parameters for the compounds and highlights the presence of charge-trapping effects. Comparison among the different compounds shows the relevance of... (More)
We investigate the conduction mechanisms of nitronyl-nitroxide (NIT) molecular radicals, as useful for the creation of nanoscopic molecular spintronic devices, finding that it does not correspond to standard Mott behavior, as previously postulated. We provide a complete investigation using transport measurements, low-energy, sub-THz spectroscopy and introducing differently substituted phenyl appendages. We show that a nontrivial surface-charge-limited regime is present in addition to the standard low-voltage Ohmic conductance. Scaling analysis allows one to determine all the main transport parameters for the compounds and highlights the presence of charge-trapping effects. Comparison among the different compounds shows the relevance of intermolecular stacking between the aromatic ring of the phenyl appendix and the NIT motif in the creation of useful electron transport channels. The importance of intermolecular pathways is further highlighted by electronic structure calculations, which clarify the nature of the electronic channels and their effect on the Mott character of the compounds.
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- author
- Dotti, N. ; Heintze, E. ; Slota, M. ; Hübner, R. ; Wang, F. LU ; Nuss, J. ; Dressel, M. and Bogani, L.
- organization
- publishing date
- 2016-04-04
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Physical Review B (Condensed Matter and Materials Physics)
- volume
- 93
- issue
- 16
- article number
- 165201
- publisher
- American Physical Society
- external identifiers
-
- scopus:84963759884
- wos:000373571200004
- ISSN
- 1098-0121
- DOI
- 10.1103/PhysRevB.93.165201
- language
- English
- LU publication?
- yes
- id
- a8da8786-49b2-4603-967f-3f133c8df5f0
- date added to LUP
- 2016-05-18 12:46:25
- date last changed
- 2024-06-28 06:23:00
@article{a8da8786-49b2-4603-967f-3f133c8df5f0,
abstract = {{<p>We investigate the conduction mechanisms of nitronyl-nitroxide (NIT) molecular radicals, as useful for the creation of nanoscopic molecular spintronic devices, finding that it does not correspond to standard Mott behavior, as previously postulated. We provide a complete investigation using transport measurements, low-energy, sub-THz spectroscopy and introducing differently substituted phenyl appendages. We show that a nontrivial surface-charge-limited regime is present in addition to the standard low-voltage Ohmic conductance. Scaling analysis allows one to determine all the main transport parameters for the compounds and highlights the presence of charge-trapping effects. Comparison among the different compounds shows the relevance of intermolecular stacking between the aromatic ring of the phenyl appendix and the NIT motif in the creation of useful electron transport channels. The importance of intermolecular pathways is further highlighted by electronic structure calculations, which clarify the nature of the electronic channels and their effect on the Mott character of the compounds.</p>}},
author = {{Dotti, N. and Heintze, E. and Slota, M. and Hübner, R. and Wang, F. and Nuss, J. and Dressel, M. and Bogani, L.}},
issn = {{1098-0121}},
language = {{eng}},
month = {{04}},
number = {{16}},
publisher = {{American Physical Society}},
series = {{Physical Review B (Condensed Matter and Materials Physics)}},
title = {{Conduction mechanism of nitronyl-nitroxide molecular magnetic compounds}},
url = {{http://dx.doi.org/10.1103/PhysRevB.93.165201}},
doi = {{10.1103/PhysRevB.93.165201}},
volume = {{93}},
year = {{2016}},
}