Exchange interactions of spin-active metallofullerenes in solid-state carbon networks

Autor(en)

Mujtaba Zaka, Jamie H. Warner, Yasuhiro Ito, John J. L. Morton, Mark Rümmeli, Thomas Pichler, Arzhang Ardavan, Hinsanori N. Shinohara, Gordon Andrew D. Briggs

Abstrakt

The electron paramagnetic resonance (EPR) of spin-active metallofullerenes (MFs) La@C-82 and Sc@C-82 diluted in solid-state C-60 crystalline matrices with molar concentrations varying from 0.4% to 100% are investigated. For dilute concentrations, the hyperfine structure of the MFs is resolved, and as the concentration increases exchange narrowing is observed leading to a single peak in the EPR. Sc@C-82 MFs are inserted into single-walled carbon nanotubes to form peapods with concentrations of 10% and 0.1%, diluted with C-60. For the case of peapods containing 10% Sc@C-82 a strong narrow peak is observed in X-band CW EPR, but not pulsed measurements. Peapods containing Ce@C-82 MFs are prepared and these also show similar CW EPR to the Sc@C-82, indicating the peak arises from charge transfer with the SWNT.

Organisation(en)

Elektronische Materialeigenschaften

Externe Organisation(en)

University of Oxford, Leibniz-Institut für Festkörper- und Werkstoffforschung Dresden, Nagoya University

Journal

Physical Review B

Band

81

Anzahl der Seiten

5

ISSN

1098-0121

DOI

https://doi.org/10.1103/PhysRevB.81.075424

Publikationsdatum

2010

Peer-reviewed

Ja

ÖFOS 2012

103018 Materialphysik

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/e8df89a7-9928-4685-ae2d-c385009169da