Switching in high-Tc superconductor current transport measurements

Conference · Fri Mar 01 00:00:00 EST 1991 · IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States)

OSTI ID:5610457

Goodrich, L F; Moreland, J; Roshko, A ^[1]

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1. National Inst. of Standards and Technology (NEL), Boulder, CO (United States). Electromagnetic Technology Div.

Switching voltages can occur in four-wire current transport measurements of sintered high-T{sub c} superconductors. These switching voltages are irreversible shifts in the voltage-current characteristic of the superconductor that result in multiple branches. The voltage along these branches can be very nonlinear as a function of current and can be positive or negative in polarity relative to the current direction. These voltages can interfere with the correct determination of resistivity and critical current density. In this paper experimental data on unaligned sintered Y{sub 1}Ba{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} which illustrate the complex nature of the voltages and the confusion they can create are presented. Models based on weak links and H{sub c1}, and on other effects, are discussed as are observations on NbTi and Nb{sub 3}Sn based superconductors.

• OSTI ID: 5610457
• Report Number(s): CONF-900944-; CODEN: IEMGA
• Journal Information: IEEE Transactions on Magnetics (Institute of Electrical and Electronics Engineers); (United States), Vol. 27:2; Conference: 1990 applied superconductivity conference, Snowmass, CO (United States), 24-28 Sep 1990; ISSN 0018-9464
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
36 MATERIALS SCIENCE
HIGH-TC SUPERCONDUCTORS
CRITICAL CURRENT
NIOBIUM BASE ALLOYS
SUPERCONDUCTIVITY
SUPERCONDUCTING COMPOSITES
ELECTRIC IMPEDANCE
TITANIUM ALLOYS
YTTRIUM COMPOUNDS
CARRIER MOBILITY
CURRENT DENSITY
WEAK-COUPLING MODEL
ALLOYS
COMPOSITE MATERIALS
CURRENTS
ELECTRIC CONDUCTIVITY
ELECTRIC CURRENTS
ELECTRICAL PROPERTIES
IMPEDANCE
MATERIALS
MATHEMATICAL MODELS
MOBILITY
NIOBIUM ALLOYS
NUCLEAR MODELS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
665412* - Superconducting Devices- (1992-)
360207 - Ceramics
Cermets
& Refractories- Superconducting Properties- (1992-)
360107 - Metals & Alloys- Superconducting Properties- (1992-)
665411 - Basic Superconductivity Studies- (1992-)