Electronic properties of K3C60 studied by 13C nuclear-magnetic-resonance spectra

Susumu Sasaki, Azusa Matsuda, C. W. Chu

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

13C nuclear-magnetic-resonance (NMR) spectra are obtained to investigate the electronic properties of a superconducting fulleride K3C60. Asymmetric line shapes below 235 K are reproduced by the powder patterns of anisotropic NMR frequency shifts (K1) of electronic single-site. The temperature (T) dependence of K1 indicates that the 13C hyperfine coupling (Aspin) has both an isotropic part (Aisospin) and an anisotropic part (Aaxspin) with Aisospin/Aaxspin = 0.78. Substantial decrease in the spin susceptibility (i.e. Xspin(Tc)/Xspin(300K) = 0.55) is not explained by the lattice contraction alone. The Knight shift values can be deduced experimentally without assuming the chemical shift values, since our analysis shows that the line shapes below Tc are affected negligibly by the magnetic-field distribution, which is consistent with the large penetration depth. We also showed the validity and consistency of our analysis.

Original languageEnglish
Pages (from-to)223-237
Number of pages15
JournalPhysica C: Superconductivity and its applications
Volume278
Issue number3-4
DOIs
Publication statusPublished - 1997 May 1
Externally publishedYes

Keywords

  • Band structure
  • C-NMR spectra
  • Hyperfine coupling
  • KC
  • Knight shift

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering

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