Fullerene Superconductors

Abstract

The electrical, magnetic and optical properties of the fullerene superconductors K3C60 and Rb3C60 have been investigated. The room temperature microwave resistivity at 60 GHz of pressed powder samples of K3C60 is approximately 5m (ohms) cm. The resistivity drops by almost one order of magnitude on cooling to 20K, indicative of metallic behavior, before the samples superconduct at T (sub) c = 19.3K. Optical reflectivity spectra are consistent with metallic materials. An extrapolation of the frequency dependence of conductivity leads to d.c. conductivities of 1.3 x 10 (exp 3) (ohm)-l and 1.2 x 10 (exp 3) (ohm)-l for K3C60 and Rb3C60, respectively. The gap values A of 24 / cm for K3C60 and 30 /cm for Rb3C60 are consistent with weak-coupling and a BCS singlet ground state. Upper critical fields of 28-30 Tesla for K3C60 and 38-55 Tesla for Rb3C60 have been measured. The lower values are from static magnetic experiments, while the upper values used pulsed magnets.

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Document Details

Document Type
Technical Report
Publication Date
Jun 17, 1993
Accession Number
ADA266749

Entities

People

  • Richard Kaner

Organizations

  • University of California, Los Angeles

Tags

DTIC Thesaurus Topics

  • Abstracts
  • Chemistry
  • Conductivity
  • Electrical Conductivity
  • Electrical Properties
  • Electricity
  • Fullerenes
  • Ground State
  • Materials
  • Military Research
  • Optical Properties
  • Phase Diagrams
  • Plasmonic Materials
  • Plasmonic Metamaterials
  • Reflectivity
  • Superconductors

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science and Engineering.
  • Molecular Photonics/Laser Physics