Fishtail effect in neutron-irradiated superconducting MgB2 single crystals
M. Zehetmayer, M. Eisterer, J. Jun, S. M. Kazakov, J. Karpinski, B. Birajdar, O. Eibl, H. W. Weber
DOI 10.1103/PhysRevB.69.054510 · Physical Review B
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Abstract
We report on the effects of neutron irradiation in superconducting MgB2 single crystals. Transmission electron microscopy investigations reveal large radiation-induced defects with dimensions comparable to the superconducting coherence length. Accordingly, measurements of the magnetic moment show pronounced modifications of the reversible and irreversible properties after irradiation. In particular, we concentrate on the emergence of a second peak (fishtail), situated near Hc2 at low neutron fluences, but extending over a large part of the superconducting phase diagram at high doses. The history dependence of the critical current density on the low-field side of the fishtail region is studied by measuring minor hysteresis loops and interpreted in terms of an order-disorder transition of the vortex lattice.
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. | 38.3 | Pressure not reported | onset |
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