11B NMR and relaxation in the MgB2 superconductor
J. K. Jung, Seung Ho Baek, F. Borsa, S. L. Bud’ko, G. Lapertot, P. C. Canfield
DOI 10.1103/PhysRevB.64.012514 · 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
11B NMR and nuclear-spin-lattice relaxation rate (NSLR) are reported at 7.2 T and 1.4 T in powder samples of the intermetallic compound MgB2 with the superconducting transition temperature in zero field Tc=39.2 K. From the first-order quadrupole perturbed NMR spectrum a quadrupole coupling frequency of 835±5 kHz is obtained. The Knight shift is very small and it decreases to zero in the superconducting phase. The NSLR follows a linear law with T1T=165±10 (secK). The results in the normal phase indicate a negligible s character of the wave function of the conduction electrons at the Fermi level. Below Tc the NSLR is strongly field dependent indicating the presence of an important contribution related to the density and the thermal motion of flux lines. No coherence peak is observed at the lower field investigated (1.4 T).
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. | 39.2 | Pressure unresolved | onset |
Similar papers
Magnetization and 11B NMR study of Mg1−xAlxB2 superconductors
similarity 0.97M. Pissas et al.
Source status unknown — claims are unverified
11B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB2
similarity 0.97G. Papavassiliou et al.
Source status unknown — claims are unverified
25Mg NMR study of the MgB2 superconductor
similarity 0.96M. Mali et al.
Source status unknown — claims are unverified
Evidence for high-frequency phonon mediated S-wave superconductivity: 11B NMR study of Al-doped MgB2
similarity 0.96H. Kotegawa et al.
Source status unknown — claims are unverified
Study of B11 and C13 NMR on doped MgB2 in the normal and in the superconducting state
similarity 0.96R. W. Bounds et al.
Source status unknown — claims are unverified
Evidence for Strong-Coupling s-Wave Superconductivity in MgB2: B11 NMR Study
similarity 0.96H. Kotegawa et al.
Source status unknown — claims are unverified