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MA: Fachverband Magnetismus

MA 6: Molecular Magnetism

MA 6.5: Talk

Monday, March 18, 2024, 10:45–11:00, EB 301

Room Temperature Ferromagnetism in Tb₃N@C₈₀ Crystals — •Lebin Yu¹, Shangfeng Yang², and Thomas Greber¹ — ¹Physik-Institut, University of Zürich, Zürich, Switzerland — ²Department of Material Science and Engineering, University of Science and Technology of China, Hefei, China

Endohedral metallofullerenes (EMFs) with paramagnetic ions such as Dy³⁺ or Tb³⁺ provide a unique platform to study a spin system. Typically, magnetic interactions between neighboring carbon cages are neglected in the explanation of magnetic order above 3 K [1]. Unexpectedly, we have observed ferromagnetism at room temperature in cubic crystals of trinuclear nitrogen molecules using SQUID magnetometry. Dissolving the crystals in toluene reduces the remanence. For the dissolved Tb₃N@C₈₀ single molecule magnets we find hysteresis at 1.8 K without remanence, which reflects the frustrated ground state like in Dy₃N@C₈₀ [2]. Such a manifestation of magnetism implies a new aspect of magnetic properties of endofullerene single molecule magnets.

[1] A. Kostanyan et al. Phys. Rev. B, 101, 134429 (2020).

[2] R. Westerström et al. Phys. Rev. B, 89, 060406(R) (2014).

Keywords: endohedral fullerenes; single molecule magnets; molecular ferromagnetism; SQUID magnetometry