Muon Spin Relaxation Studies of Superconductivity in a Crystalline Array of Weakly Coupled Metal Nanoparticles
D. Bono, A. Schnepf, J. Hartig, H. Schnöckel, G. J. Nieuwenhuys, A. Amato, L. J. de Jongh
DOI 10.1103/PhysRevLett.97.077601 · Physical Review Letters
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Abstract
We report muon-spin-relaxation studies in weak transverse fields of the superconductivity in the metal cluster compound, Ga84[N(SiMe3)2]20−Li6Br2(thf)20·2 toluene. The temperature and field dependence of the muon-spin-relaxation rate and Knight shift clearly evidence type II bulk superconductivity below Tc≈7.8 K, with Bc1≈0.06 T, Bc2≈0.26 T, κ∼2, and weak flux pinning. The data are well described by the s-wave BCS model with weak electron-phonon coupling in the clean limit. A qualitative explanation for the conduction mechanism in this novel type of narrow-band superconductor is presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Ga84[N(SiMe3)2]20-Li6Br2(thf)20*2toluene Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.8 | Pressure not reported | unknown |
| Ga84[N(SiMe3)2]20-Li6Br2(thf)20*2toluene Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 7.75 | Pressure not reported | unknown |
| Ga Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
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