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

Summary, in English

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.

• Author: Aram Kostanyan; Rasmus Westerström; David Kunhardt; Bernd Büchner; Alexey A. Popov; Thomas Greber
• Department/s: NanoLund: Centre for Nanoscience; Synchrotron Radiation Research
• Publishing year: 2020-04-27
• Language: English
• Publication/Series: Physical Review B
• Volume: 101
• Issue: 13
• Links: http://dx.doi.org/10.1103/PhysRevB.101.134429
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Condensed Matter Physics (including Material Physics, Nano Physics)
• Status: Published
• ISBN/ISSN/Other: ISSN: 2469-9950