Flux creep intergranular activation energies in YBa[sub 2]Cu[sub 3]O[sub 7] bulk superconductors

Journal Article · Sun May 01 00:00:00 EDT 1994 · Applied Physics Communications; (United States)

OSTI ID:7045258

Nikolo, M ^[1]

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1. Saint Louis Univ., MO (United States)

Ac susceptibility is used to measure a small shift of the coupling peak of the imaginary part of the ac susceptibility ([chi][double prime]) to a higher temperature as the frequency is increased. Applying the Bean model one obtains the zero-field and zero-temperature intergranular pinning potential U(0,0) and the critical, intergranular current density J[sub c](0,0) from the data. Here it is shown how one can calculate the intergranular flux creep activation energy E[sub a](T,H) as a function of the applied magnetic field H and the temperature T if the average grain radius R[sub g] and the zero temperature London penetration depth [lambda][sub L](0) are known. We arrive at E[sub a](T,H) values between 0 and about 109 meV for a range of ac fields between 0 and 20 Oe at 77 K for a sintered YBaCuO pellet. 21 refs., 1 fig.

• OSTI ID: 7045258
• Journal Information: Applied Physics Communications; (United States), Journal Name: Applied Physics Communications; (United States) Vol. 13:2; ISSN 0277-9374; ISSN APCODQ
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
360207* -- Ceramics
Cermets
& Refractories-- Superconducting Properties-- (1992-)
ACTIVATION ENERGY
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
CHALCOGENIDES
COPPER COMPOUNDS
CUPRATES
ENERGY
GRAIN BOUNDARIES
HIGH-TC SUPERCONDUCTORS
JOSEPHSON EFFECT
MAGNETIC FIELDS
MAGNETIC FLUX
MAGNETIC PROPERTIES
MAGNETIC SUSCEPTIBILITY
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
SUPERCONDUCTORS
TEMPERATURE DEPENDENCE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS