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Switching Molecular Conformation with the Torque on a Single Magnetic Moment

Kostanyan, Aram; Westerström, Rasmus LU ; Zhang, Yang; Kunhardt, David; Stania, Roland; Buchner, Bernd; Popov, Alexey and Greber, Thomas (2017) In Physical Review Letters 119.
Abstract
For the endohedral fullerene molecule HoLu2N@C80, it is shown that the endohedral HoLu2N unit may be oriented in a magnetic field. The Ho magnetic moment is fixed in the strong ligand field and aligns along the holmium-nitrogen axis. The torque of a magnetic field on the Ho magnetic moment leads to a hopping bias of the endohedral unit inclining to an orientation parallel to the externally applied field. This endohedral cluster distribution remains frozen below the onset of thermally induced rotation of the endohedral units. We derive an analytical statistical model for the description of the effect that scales below 7 T with the square of the external field strength, and that allows us to resolve the freezing temperature of the endohedral... (More)
For the endohedral fullerene molecule HoLu2N@C80, it is shown that the endohedral HoLu2N unit may be oriented in a magnetic field. The Ho magnetic moment is fixed in the strong ligand field and aligns along the holmium-nitrogen axis. The torque of a magnetic field on the Ho magnetic moment leads to a hopping bias of the endohedral unit inclining to an orientation parallel to the externally applied field. This endohedral cluster distribution remains frozen below the onset of thermally induced rotation of the endohedral units. We derive an analytical statistical model for the description of the effect that scales below 7 T with the square of the external field strength, and that allows us to resolve the freezing temperature of the endohedral hopping motion. The freezing temperature is around 55 K and depends on the cooling rate, which in turn determines an activation energy for the hopping motion of 185 meV and a prefactor of 1.8×1014  s−1. For TbSc2N@C80 we find the same behavior with a 3.5% higher freezing temperature. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review Letters
volume
119
publisher
American Physical Society
external identifiers
  • scopus:85038364022
  • wos:000417079700005
ISSN
1079-7114
DOI
10.1103/PhysRevLett.119.237202
language
English
LU publication?
yes
id
46b386f0-6009-46d2-995f-5aee8beacfa4
date added to LUP
2017-12-18 14:00:29
date last changed
2018-03-20 03:00:26
@article{46b386f0-6009-46d2-995f-5aee8beacfa4,
  abstract     = {For the endohedral fullerene molecule HoLu2N@C80, it is shown that the endohedral HoLu2N unit may be oriented in a magnetic field. The Ho magnetic moment is fixed in the strong ligand field and aligns along the holmium-nitrogen axis. The torque of a magnetic field on the Ho magnetic moment leads to a hopping bias of the endohedral unit inclining to an orientation parallel to the externally applied field. This endohedral cluster distribution remains frozen below the onset of thermally induced rotation of the endohedral units. We derive an analytical statistical model for the description of the effect that scales below 7 T with the square of the external field strength, and that allows us to resolve the freezing temperature of the endohedral hopping motion. The freezing temperature is around 55 K and depends on the cooling rate, which in turn determines an activation energy for the hopping motion of 185 meV and a prefactor of 1.8×1014  s−1. For TbSc2N@C80 we find the same behavior with a 3.5% higher freezing temperature.},
  articleno    = {237202},
  author       = {Kostanyan, Aram and Westerström, Rasmus and Zhang, Yang and  Kunhardt, David and Stania, Roland and Buchner, Bernd and Popov, Alexey  and Greber, Thomas },
  issn         = {1079-7114},
  language     = {eng},
  publisher    = {American Physical Society},
  series       = {Physical Review Letters},
  title        = {Switching Molecular Conformation with the Torque on a Single Magnetic Moment},
  url          = {http://dx.doi.org/10.1103/PhysRevLett.119.237202},
  volume       = {119},
  year         = {2017},
}