Distribution of flux-pinning energies in YBa sub 2 Cu sub 3 O sub 7 minus. delta. and Bi sub 2 Sr sub 2 CaCu sub 2 O sub 8+. delta. from flux noise

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.64.72· OSTI ID:7242797

Ferrari, M J; Johnson, M; Wellstood, F C; Clarke, J ^[1]; Mitzi, D; Rosenthal, P A; Eom, C B; Geballe, T H; Kapitulnik, A; Beasley, M R ^[2]

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1. Department of Physics, University of California, Berkeley, CA (USA) Center for Advanced Materials, Materials and Chemical Sciences Division, Lawrence Berkeley Laboratory, 1 Cyclotron Road, Berkeley, California 94720 (USA)
2. Department of Applied Physics, Stanford University, Stanford, California 94305 (USA)

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 YBa{sub 2}Cu{sub 3}O{sub 7-{delta}} and near 0.2 eV in Bi{sub 2}Sr{sub 2}CaCu{sub 2}O{sub 8+{delta}}. The noise power is proportional to the ambient magnetic field, indicating that the vortex motion is uncorrelated.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7242797
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 64:1; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

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ABSOLUTE ZERO TEMPERATURE
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BARIUM COMPOUNDS
BARIUM OXIDES
BISMUTH COMPOUNDS
BISMUTH OXIDES
CALCIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
COPPER OXIDES
CORUNDUM
ELECTRONIC EQUIPMENT
ELEMENTS
ENERGY
ENERGY RANGE
EQUILIBRIUM
EQUIPMENT
EV RANGE
FILMS
FLUCTUATIONS
FLUXMETERS
FREQUENCY DEPENDENCE
INDIUM COMPOUNDS
LEAD COMPOUNDS
LOW TEMPERATURE
MAGNETIC FIELDS
MAGNETIC FLUX
MEASURING INSTRUMENTS
METALS
MICROWAVE EQUIPMENT
MINERALS
NIOBIUM
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLATES
SAPPHIRE
SQUID DEVICES
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
SUPERCONDUCTING DEVICES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
THERMAL EQUILIBRIUM
THIN FILMS
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
ULTRALOW TEMPERATURE
VARIATIONS
VERY LOW TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES