13C NMR and static magnetic susceptibility in C60 superconductors: Possible influence of Kondo impurity
Y. Maniwa, N. Muroga, N. Sato, H. Tou, H. Shimoda, Y. Iwasa, H. Mitani, K. Kikuchi, S. Suzuki, Y. Achiba, M. Kosaka, K. Tanigaki, X. Chen, M. M. Labes
DOI 10.1103/PhysRevB.58.11603 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The static spin susceptibility, χsSQ and χsNMR, in C60 superconductors K3C60 and Rb3C60 was studied using a dc superconducting quantum interference device magnetometer and 13C NMR. We found that χsSQ has a peculiar temperature (T) dependence behaving as (1−CT2) with a positive constant C∼(1×10−6) deg−2, contrary to the almost T independent χsNMR. These observations indicate a possibility that there exist Kondo-like impurities, whose Kondo temperature is ∼500 K and whose content is ∼0.001 spins per carbon. On the basis of these studies, the lattice constant dependence of the intrinsic spin susceptibility was established to be dχs/da0=(5.7±0.4)×10−4 emu/molC60/Å in A3C60 superconductors where A is an alkali metal.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19 | Pressure not reported | onset |
| K3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 19.5 | Pressure not reported | onset |
| (NH3)0.08Rb3C60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28 | Pressure not reported | onset |
Similar papers
Analysis of 13C−NMR spectra in C60 superconductors: Hyperfine coupling constants, electronic correlation effect, and magnetic penetration depth
similarity 0.95N. Sato et al.
Source status unknown — claims are unverified
Superconducting and normal-state properties of nonavalent fullerides
similarity 0.94Y. Iwasa et al.
Source status unknown — claims are unverified
Conduction-electron spin resonance in the superconductor K3C60
similarity 0.94N. M. Nemes et al.
Source status unknown — claims are unverified
Magnetic properties of superconducting K3C60 and Rb3C60 synthesized from large single-crystal fullerenes
similarity 0.93S. H. Irons et al.
Source status unknown — claims are unverified
Mixed-state parameters and vortex pinning in single-crystalline K3C60 fullerene superconductors
similarity 0.93V. Buntar et al.
Source status unknown — claims are unverified
NMR measurement of superconducting-state spin susceptibility in alkali fullerides
similarity 0.93V. A. Stenger et al.
Source status unknown — claims are unverified