Elimination of current dissipation in high transition temperature superconductors

Journal Article · Fri Jan 19 00:00:00 EST 1990 · Science (Washington, D.C.); (USA)

DOI:https://doi.org/10.1126/science.247.4940.307· OSTI ID:6836662

Sun, J Z; Lairson, B; Eom, C B; Bravman, J; Geballe, T H ^[1]

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1. Stanford Univ., CA (USA)

The relaxation of the shielding current-induced magnetic moment in YBa{sub 2}Cu{sub 3}O{sub 7} thin films, which were grown in situ, is studied as a function of temperature. Although typical relaxations cause a large amount of decay in the magnetic shielding current (on the order of 10 to 20% for the first 1,000 seconds), it is shown that this is not necessarily a serious problem for applications such as magnets operating in persistent-current modes. This is because the decay of the magnetic shielding current depends sensitively on how far away the operating current density is from the critical current density J{sub c}. By using a quenching process the shielding current is reduced slightly below J{sub c} and the relaxation is dramatically reduced. A general relation between the relaxation rate at J{sub c} and the reduction of the relaxation rate upon lowering of the operating current is obtained and is shown to be consistent with experimental data. 14 refs., 5 figs.

• OSTI ID: 6836662
• Journal Information: Science (Washington, D.C.); (USA), Vol. 247:4940; ISSN 0036-8075
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BARIUM COMPOUNDS
SUPERCONDUCTIVITY
COPPER COMPOUNDS
MAGNETIC MOMENTS
RELAXATION
OXYGEN COMPOUNDS
YTTRIUM COMPOUNDS
EXPERIMENTAL DATA
TEMPERATURE EFFECTS
ALKALINE EARTH METAL COMPOUNDS
DATA
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
INFORMATION
NUMERICAL DATA
PHYSICAL PROPERTIES
TRANSITION ELEMENT COMPOUNDS
360603* - Materials- Properties