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

Susumu Sasaki; Azusa Matsuda; C. W. Chu

doi:10.1016/S0921-4534(97)00095-6

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

Susumu Sasaki^*, Azusa Matsuda, C. W. Chu

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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 (A^spin) has both an isotropic part (A_iso^spin) and an anisotropic part (A_ax^spin) with A_iso^spin/A_ax^spin = 0.78. Substantial decrease in the spin susceptibility (i.e. X^spin(T_c)/X^spin(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 T_c 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
DOIs	https://doi.org/10.1016/S0921-4534(97)00095-6
Publication status	Published - 1997 May 1
Externally published	Yes

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

Access to Document

10.1016/S0921-4534(97)00095-6

Cite this

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title = "Electronic properties of K3C60 studied by 13C nuclear-magnetic-resonance spectra",

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.",

keywords = "Band structure, C-NMR spectra, Hyperfine coupling, KC, Knight shift",

author = "Susumu Sasaki and Azusa Matsuda and Chu, {C. W.}",

year = "1997",

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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 (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.

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 (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.

KW - Band structure

KW - C-NMR spectra

KW - Hyperfine coupling

KW - KC

KW - Knight shift

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