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 (Aiso spin) and an anisotropic part (Aax spin) with Aiso spin/Aax spin = 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
Publication statusPublished - 1997 May 1
Externally publishedYes

Fingerprint

Electronic properties
Nuclear magnetic resonance
nuclear magnetic resonance
line shape
Chemical shift
electronics
Powders
fullerides
Magnetic fields
frequency shift
contraction
chemical equilibrium
penetration
magnetic permeability
magnetic fields
Temperature
temperature

Keywords

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

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Electronic properties of K3C60 studied by 13C nuclear-magnetic-resonance spectra. / Sasaki, Susumu; Matsuda, Azusa; Chu, C. W.

In: Physica C: Superconductivity and its Applications, Vol. 278, No. 3-4, 01.05.1997, p. 223-237.

Research output: Contribution to journalArticle

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N2 - 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 (Aiso spin) and an anisotropic part (Aax spin) with Aiso spin/Aax spin = 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.

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