Magnetic hysteresis and flux creep of YBa2Cu3Ox grown by the melt-powder-melt-growth (MPMG) process

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

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Magnetic hysteresis and flux creep of melt-powder-melt-growth (MPMG) YBa2Cu3Ox containing nominal 0, 25 and 40 mole% Y2BaCuO5 (211) were measured in the temperature range of 5 to 80 K and in magnetic fields up to 5 T. With the introduced fine dispersion of second phase 211 particles, the critical magnetization current density Jc shows a weak field dependence over a wide range of temperature, and the effective pinning energy Ueff is much enhanced. From these results, a functional expression Ueff(J, T) = -U0 G(T) (J/Ji)n is obtained, where G(T) = [1-(T/Tx)2]2 with Tx = 82.5 K near the irreversibility temperature. The observed power-law relationship of Ueff(J, T) clearly demonstrates two of three regimes as predicted by the theory of collective flux creep, namely n = 3/2 and 7/9 for J < Jc and J ≪ Jc, respectively. In addition, the divergence of Ueff at low current densities also suggests the existence of a vortex-glass state.

Original languageEnglish
Pages (from-to)1382-1385
Number of pages4
JournalIEEE Transactions on Applied Superconductivity
Volume3
Issue number1 pt 3
DOIs
Publication statusPublished - 1993 Mar
Externally publishedYes

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Magnetic hysteresis
Magnetic flux
Powders
Creep
hysteresis
Current density
current density
low currents
Temperature
temperature
Magnetization
divergence
Vortex flow
vortices
Magnetic fields
Fluxes
Glass
magnetization
glass
magnetic fields

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Physics and Astronomy (miscellaneous)

Cite this

Magnetic hysteresis and flux creep of YBa2Cu3Ox grown by the melt-powder-melt-growth (MPMG) process. / Kung, P. J.; Maley, M. P.; Willis, J. O.; McHenry, M. E.; Murakami, Masato; Tanaka, S.

In: IEEE Transactions on Applied Superconductivity, Vol. 3, No. 1 pt 3, 03.1993, p. 1382-1385.

Research output: Contribution to journalArticle

Kung, P. J. ; Maley, M. P. ; Willis, J. O. ; McHenry, M. E. ; Murakami, Masato ; Tanaka, S. / Magnetic hysteresis and flux creep of YBa2Cu3Ox grown by the melt-powder-melt-growth (MPMG) process. In: IEEE Transactions on Applied Superconductivity. 1993 ; Vol. 3, No. 1 pt 3. pp. 1382-1385.
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