Magnetic field dependence of the reversible mixed-state properties of superconducting MgB2 single crystals and the influence of artificial defects
M. Zehetmayer, M. Eisterer, J. Jun, S. M. Kazakov, J. Karpinski, H. W. Weber
DOI 10.1103/PhysRevB.70.214516 · Physical Review B
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Abstract
The reversible mixed-state properties of superconducting MgB2 are summarized and discussed in terms of new results and evaluations, which take the two band character of the material explicitly into account. The magnetic field dependence of the reversible magnetization is analyzed within Ginzburg Landau theory which, however, fits only either at high or at low fields. The resulting parameters (e.g., characteristic fields, lengths, and anisotropy) are quite different in these two regimes. We find large anisotropies of about 4.6 at high fields and low temperatures, but values close to 1 at low fields. Finally, we present neutron irradiation experiments, where new defects, leading to strong irreversibility but also to a modification of the reversible properties, are induced.
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. | 38.4 | Pressure not reported | onset |
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