Magnetization and 11B NMR study of Mg1−xAlxB2 superconductors
M. Pissas, G. Papavassiliou, M. Karayanni, M. Fardis, I. Maurin, I. Margiolaki, K. Prassides, C. Christides
DOI 10.1103/PhysRevB.65.184514 · Physical Review B
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Abstract
We demonstrate the magnetic-field distribution of the pure vortex state in lightly doped Mg1−xAlxB2 (x<~0.025) powder samples, by using 11B nuclear magnetic resonance in magnetic fields of 23.5 and 47 kOe. The magnetic-field distribution at T=5 K is Al-doping dependent, revealing a considerable decrease of anisotropy in respect to pure MgB2. This result correlates nicely with magnetization measurements and is consistent with σ-band hole driven superconductivity for MgB2.
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 | unknown |
| Mg0.99Al0.01B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37.9 | Pressure not reported | unknown |
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