Phys. Rev. Lett. 64, 72 - 75 (1990)Distribution of flux-pinning energies in YBa2Cu3O7-δ and Bi2Sr2CaCu2O8+δ from flux noise |
PRL Celebrates 50 Years
This Week's Milestone Letters are from 1981: |
M. J. Ferrari, Mark Johnson, Frederick C. Wellstood, and John Clarke
Department of Physics, University of California, Berkeley, and Center for Advanced Materials, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720
D. Mitzi, P. A. Rosenthal, C. B. Eom, T. H. Geballe, A. Kapitulnik, and M. R. Beasley
Department of Applied Physics, Stanford University, Stanford, California 94305
Received 14 August 1989
The spectral density of the magnetic flux noise measured in high-temperature superconductors in low magnetic fields scales approximately as the inverse of the frequency and increases with temperature. We use the temperature and frequency dependence of the noise to determine the pinning energies of individual flux vortices in thermal equilibrium. The distribution of pinning energies peaks below 0.1 eV in YBa2Cu3O7-δ and near 0.2 eV in Bi2Sr2CaCu2O8+δ. The noise power is proportional to the ambient magnetic field, indicating that the vortex motion is uncorrelated.
©1990 The American Physical Society
URL: http://link.aps.org/abstract/PRL/v64/p72
DOI: 10.1103/PhysRevLett.64.72
PACS: 74.60.Ge, 74.40.+k, 74.70.Vy
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