Systematic study of the superconducting and normal-state properties of neutron-irradiated MgB2
R. H. T. Wilke, S. L. Bud’ko, P. C. Canfield, J. Farmer, S. T. Hannahs
DOI 10.1103/PhysRevB.73.134512 · Physical Review B
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Abstract
We have performed a systematic study of the evolution of the superconducting and normal state properties of neutron-irradiated MgB2 wire segments as a function of fluence and post exposure annealing temperature and time. All fluences used suppressed the transition temperature, Tc, below 5K and expanded the unit cell. For each annealing temperature Tc recovers with annealing time and the upper critical field, Hc2(T=0), approximately scales with Tc. By judicious choice of fluence, annealing temperature, and time, the Tc of damaged MgB2 can be tuned to virtually any value between 5 and 39K. For higher annealing temperatures and longer annealing times, the recovery of Tc tends to coincide with a decrease in the normal state resistivity and a systematic recovery of the lattice parameters.
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 |
| MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | unknown |
| Mg11B2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.2 | Pressure not reported | unknown |
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