Physics – Condensed Matter – Superconductivity
Scientific paper
1999-03-28
Physics
Condensed Matter
Superconductivity
4 pages, 4 figures, submitted to Physical Review B additional comments on the interperation of the results
Scientific paper
10.1103/PhysRevB.61.717
We have measured an angle-dependent contribution to the equilibrium magnetization of a YBa_2Cu_3O_{7-d} single crystal with columnar defects created by 5.8GeV Pb ions. This contribution manifests itself as a jump in the equilibrium torque signal, when the magnetic field crosses that of the defects. The magnitude of the signal, which is observed in a narrow temperature interval less than 2K and for fields up to about twice the irradiation field, is used to estimate the the energy gained by vortex pinning on the defects. The vanishing of the effective pinning energy at a temperature below Tc is attributed to its renormalization by thermal fluctuations.
der Beek Cornelis J. van
Fruchter Luc
Hayani B.
Johnson Thomas S.
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