Abstract
At present the thermal spike description of heavy ion track formation in high-T c superconductors is confronted with serious difficulties caused by a high sensitivity of theoretical track radii to a small change of the electron diffusivity value. This sensitivity is caused by a bifurcation point found numerically in the model and resembles the impossibility of the classical gas description in the mechanics framework due to a dramatic dependence of particle trajectories on small variations of the initial conditions. For solution of the problem, we suggest a thermal explosion model, which takes into account such a nonequilibrium process as superheating known from laser-induced phase transformations in solids. This allows us to stabilize essentially the theory. For the first time we give a quantitative description of tracks in YBa2Cu3O7 − x with both elliptical and circular cross sections.
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Kostenko, B.F., Pribiš, J. Theoretical evidences for superheating during track formation in high-T c superconductors. Phys. Part. Nuclei Lett. 5, 305–309 (2008). https://doi.org/10.1134/S1547477108030369
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DOI: https://doi.org/10.1134/S1547477108030369