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

doi:10.1109/77.233641

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 journal › Comment/debate › peer-review

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 language	English
Pages (from-to)	1382-1385
Number of pages	4
Journal	IEEE Transactions on Applied Superconductivity
Volume	3
Issue number	1
DOIs	https://doi.org/10.1109/77.233641
Publication status	Published - 1993 Mar
Externally published	Yes

ASJC Scopus subject areas

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

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

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.",

author = "Rung, {P. J.} and Maley, {M. P.} and Willis, {J. O.} and McHenry, {M. E.} and M. Murakami and S. Tanakac",

year = "1993",

month = mar,

doi = "10.1109/77.233641",

language = "English",

volume = "3",

pages = "1382--1385",

journal = "IEEE Transactions on Applied Superconductivity",

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T1 - Magnetic Hysteresis and Flux Creep of YBa2Cu3Ox Grown by the Melt-Powder-Melt-Growth (Mpmg) Process

AU - Rung, P. J.

AU - Maley, M. P.

AU - Willis, J. O.

AU - McHenry, M. E.

AU - Murakami, M.

AU - Tanakac, S.

PY - 1993/3

Y1 - 1993/3

N2 - 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.

AB - 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.

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

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