Antiferromagnetically Enhanced 13 C Spin-Lattice Relaxation in K3C60 - No Evidence of Electronic Multi-Sites

Susumu Sasaki, Azusa Matsuda, C. W. Chu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We report a study of 13C NMR spin-lattice relaxation in the superconducting fulleride K3C60 at low temperatures (T). The experimentally obtained relaxation data, which are scaled to a T-independent relaxation shape, are found to be well reproduced by the anisotropy parameter αspin ≡ Aiso spin/Aax spin, where Aiso spin and Aax spin are the isotropic and anisotropic part of the 13 C hyperfine coupling of conduction electrons, respectively. Simulation for a powder sample with various αspin values indicates that the deviation from a single-exponential relaxation is largest when the hyperfine coupling is isotropic to some extent (i.e., αspin ≈ 0.5) instead of purely anisotropic (i.e., αspin = 0). These results justify a model based on the electronic single site. Moreover, from the validity of the extended Korringa relation with K(α) = 5.7, it is found that the electronic state is a Fermi liquid in which the relaxation rate is enhanced substantially by the antiferromagnetic electron interaction.

Original languageEnglish
Pages (from-to)3696-3699
Number of pages4
JournalJournal of the Physical Society of Japan
Volume65
Issue number12
Publication statusPublished - 1996
Externally publishedYes

Fingerprint

spin-lattice relaxation
electronics
fullerides
Fermi liquids
conduction electrons
electron scattering
deviation
nuclear magnetic resonance
anisotropy
simulation

Keywords

  • C NMR
  • Anisotropy
  • Antiferromagnetic interaction
  • Extended Korringa relation
  • Hyperfine coupling
  • KC
  • Random phase approximation
  • Single site
  • Spin-lattice relaxation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Antiferromagnetically Enhanced 13 C Spin-Lattice Relaxation in K3C60 - No Evidence of Electronic Multi-Sites. / Sasaki, Susumu; Matsuda, Azusa; Chu, C. W.

In: Journal of the Physical Society of Japan, Vol. 65, No. 12, 1996, p. 3696-3699.

Research output: Contribution to journalArticle

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N2 - We report a study of 13C NMR spin-lattice relaxation in the superconducting fulleride K3C60 at low temperatures (T). The experimentally obtained relaxation data, which are scaled to a T-independent relaxation shape, are found to be well reproduced by the anisotropy parameter αspin ≡ Aiso spin/Aax spin, where Aiso spin and Aax spin are the isotropic and anisotropic part of the 13 C hyperfine coupling of conduction electrons, respectively. Simulation for a powder sample with various αspin values indicates that the deviation from a single-exponential relaxation is largest when the hyperfine coupling is isotropic to some extent (i.e., αspin ≈ 0.5) instead of purely anisotropic (i.e., αspin = 0). These results justify a model based on the electronic single site. Moreover, from the validity of the extended Korringa relation with K(α) = 5.7, it is found that the electronic state is a Fermi liquid in which the relaxation rate is enhanced substantially by the antiferromagnetic electron interaction.

AB - We report a study of 13C NMR spin-lattice relaxation in the superconducting fulleride K3C60 at low temperatures (T). The experimentally obtained relaxation data, which are scaled to a T-independent relaxation shape, are found to be well reproduced by the anisotropy parameter αspin ≡ Aiso spin/Aax spin, where Aiso spin and Aax spin are the isotropic and anisotropic part of the 13 C hyperfine coupling of conduction electrons, respectively. Simulation for a powder sample with various αspin values indicates that the deviation from a single-exponential relaxation is largest when the hyperfine coupling is isotropic to some extent (i.e., αspin ≈ 0.5) instead of purely anisotropic (i.e., αspin = 0). These results justify a model based on the electronic single site. Moreover, from the validity of the extended Korringa relation with K(α) = 5.7, it is found that the electronic state is a Fermi liquid in which the relaxation rate is enhanced substantially by the antiferromagnetic electron interaction.

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