11B NMR detection of the magnetic field distribution in the mixed superconducting state of MgB2
G. Papavassiliou, M. Pissas, M. Fardis, M. Karayanni, C. Christides
DOI 10.1103/PhysRevB.65.012510 · Physical Review B
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Abstract
The temperature dependence of the magnetic field distribution in the mixed superconducting phase of randomly oriented MgB2 powder was probed by 11B nuclear magnetic resonance (NMR) spectroscopy. Below the temperature of the second critical (Bc2) field, Tc2≈27 K, our spectra reveal two NMR signal components, one mapping the magnetic field distribution in the mixed superconducting state and the other one arising from the normal state. The complementary use of bulk magnetization and NMR measurements reveals that MgB2 is an anisotropic superconductor with a Bc2c<2.35 T anisotropy parameter γ≈6.
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. | 27 | Pressure not reported | onset |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 27 | Pressure not reported | onset |
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