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NIMUsing 30 MeV C60 fullerene irradiation, we have produced latent tracks of diameter 20 nm and length 200 nm, near the surface of single crystalline Bi2Sr2CaCu2O8+δ. 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 potentia

Vortex Phase Diagram in Bi2Sr2CaCu2O8+δwith Damage Tracks Created by 30 MeV Fullerene Irradiation

Vortex Phase Diagram in Bi₂Sr₂CaCu₂O_8+δwith Damage Tracks Created by 30 MeV Fullerene Irradiation