Dresden 2026 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 7: Poster Magnetism I
MA 7.73: Poster
Montag, 9. März 2026, 09:30–12:30, P2
Investigation of the hyperfine coupling constants of the endohedral fullerene N@C60 — •Rebecca Löffler, Marco Sommer, and Johann Klare — Inst. of Physics, Univ. Osnabrück, Barbarastr. 7, 49076 Osnabrück, Germany
Endohedral fullerenes such as N@C60 are considered promising systems for spin-based quantum bits and quantum sensors on a nanoscale due to their exceptional spin stability and long coherence times, even at room temperature. In this work, the temperature-dependent hyperfine coupling constant of N@C60 in various solvents was investigated using EPR spectroscopy. To understand the influence of the chemical environment, crystalline N@C60 was introduced into organic solvents (toluene, CS2) and into an aqueous host*guest complex with two γ-cyclodextrin molecules and then compared. The results show that a vibration model to Waiblinger (PhD thesis, Univ. Konstanz, 2001) reliably describes the behavior of N@C60 in crystalline form and in organic solvents, but cannot be applied to the γ-cyclodextrin complex. For crystalline N@C60, a vibrational energy of E = (14,7 ± 0,2) meV was determined. Phase transitions could be detected in toluene and in the γ-cyclodextrin complex by changes in the hyperfine coupling constants. The results show that the hyperfine coupling constant has great potential for use in quantum sensor technology, especially for precise measurements of phase transitions, such as the freezing of water.
Keywords: N@C60; EPR; hyperfine coupling; quantum sensing; fullerenes