Advanced

Conduction mechanism of nitronyl-nitroxide molecular magnetic compounds

Dotti, N.; Heintze, E.; Slota, M.; Hübner, R.; Wang, F. LU ; Nuss, J.; Dressel, M. and Bogani, L. (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.

(Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
93
issue
16
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
2016-11-02 15:14:30
@misc{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    = {ARRAY(0x91d2e10)},
  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},
  volume       = {93},
  year         = {2016},
}