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 language | English |
|---|---|
| Pages (from-to) | 223-237 |
| Number of pages | 15 |
| Journal | Physica C: Superconductivity and its Applications |
| Volume | 278 |
| Issue number | 3-4 |
| Publication status | Published - 1997 May 1 |
| Externally published | Yes |
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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 journal › Article
}
TY - JOUR
T1 - Electronic properties of K3C60 studied by 13C nuclear-magnetic-resonance spectra
AU - Sasaki, Susumu
AU - Matsuda, Azusa
AU - Chu, C. W.
PY - 1997/5/1
Y1 - 1997/5/1
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.
AB - 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.
KW - C-NMR spectra
KW - Band structure
KW - Hyperfine coupling
KW - KC
KW - Knight shift
UR - http://www.scopus.com/inward/record.url?scp=0031143234&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0031143234&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0031143234
VL - 278
SP - 223
EP - 237
JO - Physica C: Superconductivity and its Applications
JF - Physica C: Superconductivity and its Applications
SN - 0921-4534
IS - 3-4
ER -