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- W55117523 abstract "Surface columnar defects, SCDs, are produced in high quality Ag/BSCCO tapes by irradiating them with 0.25 GeV gold ions only on a top layer up to 10% of the full volume. The ion beam is orthogonal to the tape plane. Such defects seem to be able to confine the vortices inside tubes having a diameter determined by the surface columnar defect average distance. This confinement shows itself in the shift of irreversibility lines (ILs) towards high temperatures and magnetic fields, in the enhancement of critical current densities and in the strong decrease of the dependence of ILs on frequency. In this paper we concentrate on the shutdown of the IL anisotropy (low current regime) as well as on the decrease of the critical current density anisotropy (high current regime). IL anisotropy is also studied as a function of the angle between the applied magnetic field and the ion tracks. Two results are to be emphasized, because they are peculiar to the SCD topology: 1) the enhancement of the superconducting properties when the magnetic field is applied parallel to the ion tracks does not compromise the superconducting properties with the field perpendicular to the ion tracks, which are unchanged. 2) A dose dependent zone of the ILs exists (toward highest temperature and lowest magnetic field), where SCDs do not affect the intrinsic properties of the material. On the contrary, a Bose-glass-like phase starting just at the mentioned dose dependent point phase (T onset , B onset ) is induced by the defects. A correlation between the two features is discussed on the basis of recent models." @default.
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- W55117523 date "2000-01-01" @default.
- W55117523 modified "2023-09-27" @default.
- W55117523 title "Control of anisotropy in Bi1.8Pb0.33Sr1.87Ca2Cu3Oy tapes by means of surface columnar defects" @default.
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