Melting of the vortex-solid in irradiated Bi2Sr2CaCu2O8+δ single crystals in tilted magnetic fields
نویسندگان
چکیده
We study the boundary between the vortex-solid and the vortex-liquid phases in the Hc–Hab plane, for irradiated Bi2Sr2CaCu2O8+δ single crystals, by measuring the ac-local magnetic permeability in tilted magnetic fields. For high temperatures and at the phase boundary, we find that the c-axis magnetic field component H trans c decreases linearly when increasing the in-plane magnetic field Hab, surprisingly in a wider angular range than in pristine samples. Strikingly, at lower temperatures, this linear decrease of H trans c (Hab) transforms to a concave, hyperbolic-like, curve that differs even more strongly from the usual Ginzburg– Landau (GL) elliptical phase boundary. We also propose a theoretical approach to solve this puzzle. New Journal of Physics 8 (2006) 226 PII: S1367-2630(06)29199-7 1367-2630/06/010226+14$30.00 © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft 2 Institute of Physics DEUTSCHE PHYSIKALISCHE GESELLSCHAFT
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