Free Radicals in K and Rb Admixtured Fullerene C_{60}

• Authors: J. Stankowski , W. Kempiński , P. Byszewski , Z. Trybuła
• Languages of publication: EN

Abstracts

EN

Molecules of C_{60} form Van der Waals type crystals. The observations reported here concern EPR investigations of such C_{60} samples with only a slight amount of Rb or K. Detected defects are (C_{60})^{+} or (C_{60})^{y-} ion-radicals. A hole (h) or trapped electron (t) are localized on one fullerene ball. In the case of potassium fullerites C_{60}:K the line shape of EPR signal was of the Dysonian form which is characteristic of conducting electrons in metal. The EPR lines of holes (C_{60})^{+} are characterized by g_{h} ≥ g_{0} whereas for electrons g_{t} is below the value g_{0} = 2.0023 characteristic of a free electron (g_{t} ≤ g_{0}). The EPR linewidth 2ΔB^{h}_{1s} of the (C_{60})^{+} weakly increased with decreasing temperature whereas the EPR linewidth attributed to the electron 2ΔB^{t}_{1s} significantly decreases with decreasing temperature. The C_{60}:K sample reached superconducting phase below T_{c} = 11 K which is significantly less than T_{c} = 16.5 K observed for K_{x}C_{60} where 2 ≤ x ≤ 4.

Keywords

EN

76.30.Rn; 74.70.Wz

Discipline

• 76.30.Rn: Free radicals
• 74.70.Wz: Carbon-based superconductors

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 1993
• Volume: 84
• Issue: 6
• Pages: 1117-1123

Dates

published

1993-12

received

1993-07-12

(unknown)

1993-10-11

Contributors

author

J. Stankowski

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

W. Kempiński

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

author

P. Byszewski

• Institute of Physics, Polish Academy of Sciences, Al. Lotników 32/46, 02-668 Warszawa, Poland

author

Z. Trybuła

• Institute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland

Identifiers

DOI

10.12693/APhysPolA.84.1117