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M. Zehetmayer, M. Eisterer, C. Krutzler, J. Jun, S. Kazakov, J. Karpinski, H. W. Weber:
"Order-disorder transition in the flux line lattice of superconducting MgB₂ single crystals with artificially introduced defects: comparison with theory";
Superconductor Science and Technology, 20 (2007), S247 - S256.

We report on the order-disorder transition line (Bod) in the flux line
lattice-illustrated by the fishtail effect-of pure and carbon doped
superconducting MgB2 single crystals. Neutron irradiation offers a unique opportunity for varying the defect density (nd) in a controlled way and to determine Bod not only as a function of temperature (T ), but also as a function of nd. Experimental data are compared with theoretical predictions and found to be in good agreement over most of the available parameter range, both for Bod(T ) and Bod(nd). Including two-band effects in MgB2 in
quite a rough way leads to even better agreement.