Evidence for Strong-Coupling s-Wave Superconductivity in MgB2: B11 NMR Study
H. Kotegawa, K. Ishida, Y. Kitaoka, T. Muranaka, J. Akimitsu
DOI 10.1103/PhysRevLett.87.127001 · Physical Review Letters
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
We have investigated a gap structure in a newly discovered superconductor, MgB2, through measurement of the 11B nuclear spin-lattice relaxation rate, 11(1/T1). 11(1/T1) is proportional to the temperature (T) in the normal state, and decreases exponentially in the superconducting (SC) state, revealing a tiny coherence peak just below Tc. The T dependence of 1/T1 in the SC state can be accounted for by an s-wave SC model with a large gap size of 2Δ/kBTc∼5 which suggests it is in a strong-coupling regime.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.5 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 29 | Pressure not reported | onset |
| Mg11B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 39.2 | Pressure not reported | unknown |
| Mg10B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40.2 | Pressure not reported | unknown |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| TlMo6Se7.5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.2 | Pressure not reported | unknown |
| Rb2CsC60 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 31 | Pressure not reported | unknown |
| La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38 | Pressure not reported | unknown |
Similar papers
11B NMR and relaxation in the MgB2 superconductor
similarity 0.97J. K. Jung et al.
Source status unknown — claims are unverified
s-wave superconductivity in superconducting BaTi2Sb2O revealed by 121/123Sb-NMR/nuclear quadrupole resonance measurements
similarity 0.96S. Kitagawa et al.
Source status unknown — claims are unverified
Orbital magnetic dynamics in chiral p-wave superconductors
similarity 0.96V. Braude & E. B. Sonin
Source status unknown — claims are unverified
Tunneling spectroscopy and magnetization measurements of the superconducting properties of MgB2
similarity 0.96Amos Sharoni et al.
Source status unknown — claims are unverified
Thermodynamic and Transport Properties of Superconducting Mg10B2
similarity 0.95D. K. Finnemore et al.
Source status unknown — claims are unverified
Site-selective NMR for odd-frequency Cooper pairs around vortex in chiral p-wave superconductors
similarity 0.95Kenta K. Tanaka et al.
Source status unknown — claims are unverified