Physics – Condensed Matter – Superconductivity
Scientific paper
2004-04-09
Journal of the Physical Society of Japan, vol. 73, No. 10, pp 2813-2821 (2004).
Physics
Condensed Matter
Superconductivity
10 pages, 13 figures
Scientific paper
10.1143/JPSJ.73.2813
Using 30 MeV C60 fullerene irradiation, we have produced latent tracks of diameter 20 nm and length 200 nm, near the surface of single crystalline BSCCO. A preliminary transmission electron microscopy study shows evidence for a very high density of deposited energy, and the ejection of material from the track core in very thin specimens. The latent tracks reveal themselves to be exceptionally strong pinning centers for vortices in the superconducting mixed state. Both the critical current density and magnetic irreversibility line are significantly enhanced. The irradiated crystals present salient features of the (B,T) phase diagram of vortex matter both of pristine crystals, such as the first order vortex phase transition, and the exponential Bose-glass line characteristic of heavy ion-irradiated crystals. We show that the latter is manifestly independent of the pinning potential.
Della-Negra S.
der Beek Cornelis J. van
dunlop A.
Ishikawa Naoto
Jaskierowicz G.
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