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Sub-Kelvin hysteresis of the dilanthanide single-molecule magnet Tb2ScN@ C80

Kostanyan, Aram ; Westerström, Rasmus LU ; Kunhardt, David ; Büchner, Bernd ; Popov, Alexey A. and Greber, Thomas (2020) In Physical Review B 101(13).
Abstract

Magnetic hysteresis is a direct manifestation of nonequilibrium physics that has to be understood if a system is to be used for information storage and processing. The dilanthanide endofullerene Tb2ScN@C80 is shown to be a single-molecule magnet with a remanence time on the order of 100 s at 400 mK. Three different temperature-dependent relaxation barriers are discerned. The lowest 1 K barrier is assigned to intermolecular dipole-dipole interaction, the 10 K barrier to intramolecular exchange and dipolar coupling, and the 50 K barrier to molecular vibrations as was observed for Dy2ScN@C80. The 4 orders of magnitude difference in the prefactor between the Tb and the Dy compound in the decay process across the 10 K barrier is assigned to... (More)

Magnetic hysteresis is a direct manifestation of nonequilibrium physics that has to be understood if a system is to be used for information storage and processing. The dilanthanide endofullerene Tb2ScN@C80 is shown to be a single-molecule magnet with a remanence time on the order of 100 s at 400 mK. Three different temperature-dependent relaxation barriers are discerned. The lowest 1 K barrier is assigned to intermolecular dipole-dipole interaction, the 10 K barrier to intramolecular exchange and dipolar coupling, and the 50 K barrier to molecular vibrations as was observed for Dy2ScN@C80. The 4 orders of magnitude difference in the prefactor between the Tb and the Dy compound in the decay process across the 10 K barrier is assigned to the lack of Kramers protection in Tb3+. The sub-Kelvin hysteresis follows changes in the magnetization at level crossings of the four possible Tb2 ground-state configurations. Comparison to a hysteresis model, with magnetic relaxation at level crossings only, reveals cooperative action between nearby molecules.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
101
issue
13
article number
134429
publisher
American Physical Society
external identifiers
  • scopus:85084914625
ISSN
2469-9950
DOI
10.1103/PhysRevB.101.134429
language
English
LU publication?
yes
id
04657122-51aa-4a28-ab09-96c40bc701e8
date added to LUP
2020-06-24 14:08:34
date last changed
2020-12-29 02:49:04
@article{04657122-51aa-4a28-ab09-96c40bc701e8,
  abstract     = {<p>Magnetic hysteresis is a direct manifestation of nonequilibrium physics that has to be understood if a system is to be used for information storage and processing. The dilanthanide endofullerene Tb2ScN@C80 is shown to be a single-molecule magnet with a remanence time on the order of 100 s at 400 mK. Three different temperature-dependent relaxation barriers are discerned. The lowest 1 K barrier is assigned to intermolecular dipole-dipole interaction, the 10 K barrier to intramolecular exchange and dipolar coupling, and the 50 K barrier to molecular vibrations as was observed for Dy2ScN@C80. The 4 orders of magnitude difference in the prefactor between the Tb and the Dy compound in the decay process across the 10 K barrier is assigned to the lack of Kramers protection in Tb3+. The sub-Kelvin hysteresis follows changes in the magnetization at level crossings of the four possible Tb2 ground-state configurations. Comparison to a hysteresis model, with magnetic relaxation at level crossings only, reveals cooperative action between nearby molecules.</p>},
  author       = {Kostanyan, Aram and Westerström, Rasmus and Kunhardt, David and Büchner, Bernd and Popov, Alexey A. and Greber, Thomas},
  issn         = {2469-9950},
  language     = {eng},
  month        = {04},
  number       = {13},
  publisher    = {American Physical Society},
  series       = {Physical Review B},
  title        = {Sub-Kelvin hysteresis of the dilanthanide single-molecule magnet Tb2ScN@ C80},
  url          = {http://dx.doi.org/10.1103/PhysRevB.101.134429},
  doi          = {10.1103/PhysRevB.101.134429},
  volume       = {101},
  year         = {2020},
}