Magnetic hysteresis and flux creep of melt-powder-melt-growth YBa2Cu3O7 superconductors

P. J. Kung, M. P. Maley, M. E. McHenry, J. O. Willis, J. Y. Coulter, Masato Murakami, S. Tanaka

Research output: Contribution to journalArticle

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Abstract

Magnetic hysteresis and flux creep characteristics in melt-powder-melt- growth YBa2Cu3O7 with Y2BaCuO5 inclusions were measured between 5 and 80 K for magnetic fields up to 5 T. The critical magnetization current densities which were calculated using the Bean model and the sample dimension show a weak dependence on magnetic field. The Jc values are of the order of 104 A/cm2 at 60 K over the investigated field range. The magnetic relaxation rate Q=-dM/d lnt first drops monotonically with increasing temperatures and then gradually saturates, which is similar to the behavior of the initial magnetization M0 versus temperature. The normalized relaxation rate S=d lnM/d lnt, plotted as a function of temperature, shows a maximum at around 30 K, and the corresponding values of S and T at the maximum are field dependent. A scaling relationship Ueff(J,H)=UiG(T)F(J/Ji)/H0.55, where G(T)=1-(T/Tx)2, F(J/Ji)(J/Ji)-n, and Ui and Ji are scaling constants, is proposed to fit the creep data from which a universal curve is attained. The characteristic temperature Tx for the scaling function G(T) is determined from the irreversibility line. The current-dependent behavior of Ueff obtained from this work agrees qualitatively with the result predicted by the theory of collective flux creep and suggests a vortex-glass state at low current density.

Original languageEnglish
Pages (from-to)6427-6434
Number of pages8
JournalPhysical Review B
Volume46
Issue number10
DOIs
Publication statusPublished - 1992
Externally publishedYes

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Magnetic hysteresis
Magnetic flux
Powders
Superconducting materials
Creep
hysteresis
scaling
Magnetization
Current density
Magnetic fields
current density
Magnetic relaxation
Temperature
magnetization
temperature
magnetic relaxation
low currents
magnetic fields
Vortex flow
inclusions

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Kung, P. J., Maley, M. P., McHenry, M. E., Willis, J. O., Coulter, J. Y., Murakami, M., & Tanaka, S. (1992). Magnetic hysteresis and flux creep of melt-powder-melt-growth YBa2Cu3O7 superconductors. Physical Review B, 46(10), 6427-6434. https://doi.org/10.1103/PhysRevB.46.6427

Magnetic hysteresis and flux creep of melt-powder-melt-growth YBa2Cu3O7 superconductors. / Kung, P. J.; Maley, M. P.; McHenry, M. E.; Willis, J. O.; Coulter, J. Y.; Murakami, Masato; Tanaka, S.

In: Physical Review B, Vol. 46, No. 10, 1992, p. 6427-6434.

Research output: Contribution to journalArticle

Kung, PJ, Maley, MP, McHenry, ME, Willis, JO, Coulter, JY, Murakami, M & Tanaka, S 1992, 'Magnetic hysteresis and flux creep of melt-powder-melt-growth YBa2Cu3O7 superconductors', Physical Review B, vol. 46, no. 10, pp. 6427-6434. https://doi.org/10.1103/PhysRevB.46.6427
Kung, P. J. ; Maley, M. P. ; McHenry, M. E. ; Willis, J. O. ; Coulter, J. Y. ; Murakami, Masato ; Tanaka, S. / Magnetic hysteresis and flux creep of melt-powder-melt-growth YBa2Cu3O7 superconductors. In: Physical Review B. 1992 ; Vol. 46, No. 10. pp. 6427-6434.
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