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Switching molecular conformation with the torque on a single magnetic moment


Kostanyan, Aram; Westerström, Rasmus; Zhang, Yang; Kunhardt, David; Stania, Roland; Büchner, Bernd; Popov, Alexey A; Greber, Thomas (2017). Switching molecular conformation with the torque on a single magnetic moment. Physical Review Letters, 119(23):237202.

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.

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.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2017
Deposited On:19 Jan 2018 21:41
Last Modified:19 Aug 2018 13:00
Publisher:American Physical Society
ISSN:0031-9007
OA Status:Green
Publisher DOI:https://doi.org/10.1103/PhysRevLett.119.237202
PubMed ID:29286680
Project Information:
  • : FunderSNSF
  • : Grant ID206021_150784
  • : Project TitleAn AC Sub-Kelvin Magnetometer at the University of Zürich Irchel (ASKUZI)
  • : FunderSNSF
  • : Grant ID200020_153312
  • : Project TitleSurface physics with single-layer materials and molecular layers
  • : FunderSNSF
  • : Grant ID200021L_147201
  • : Project TitleNitride Cluster Fullerene Spin Shuttles: The role of cluster composition for single molecule magnet behavior
  • : FunderH2020
  • : Grant ID648295
  • : Project TitleGraM3 - Surface-grafted metallofullerene molecular magnets with controllable alignment of magnetic moments

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