Magnetic Hysteresis and Flux Creep of YBa2Cu3Ox Grown by the Melt-Powder-Melt-Growth (Mpmg) Process

P. J. Rung, M. P. Maley, J. O. Willis, M. E. McHenry, M. Murakami, S. Tanakac

Research output: Contribution to journalComment/debate

4 Citations (Scopus)

Abstract

Magnetic hysteresis and flux creep of melt-powder-melt-growth (MPMG) YBa2Cu3Ox containing nominal 0, 25 and 40 mole% Y2BaCuOs (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 UeffCA T) =-U0 G(J) (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
DOIs
Publication statusPublished - 1993 Mar

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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