Flux pinning by Y2BaCuO5 precipitates and field- and temperature-driven pinning centers in melt-powder-melt-growth processed YBa2Cu3O7

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

Research output: Contribution to journalArticle

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Abstract

Magnetic hysteresis, flux pinning, and flux creep in melt-powder-melt-growth processed YBa2Cu3O7 (Y 1:2:3) containing nominal 0, 25, and 40 mol % concentration of Y2BaCuO5 (Y 2:1:1) inclusions were investigated. The strong pinning due to 2:1:1-phase precipitates in these samples allows for characterization of the hysteretic response as a function of pinning-site concentration over a large portion of magnetic-field-temperature space. We have found the following: (i) The curves of effective pinning energy Ueff versus current density J reveal a diverging behavior of Ueff(J) in the low-J regime. This supports the existence of a vortex-glass state, and is a signature of a vanishing resistance as the current density approaches zero. (ii) Both the Ueff and the J values obtained from magnetic hysteresis loops were observed to increase with Y 2:1:1 concentration. The appearance of the butterfly-shaped (or ''fishtail'') hysteresis loops indicates a Jc that is an increasing function of H (or B). Moreover, it has been demonstrated that the additional pinning leads to an increase in Ueff in an H-T region in which the butterfly is developed. The derived effective pinning energy is fit, from the instantaneous experimental relaxation data, to the relation, Ueff(J,T,H)=Ui[G(T)/Hn](Ji/J)μ, where Ui is the scale of the activation energy, G(T) =[1-(T/Tx)2]m, and Tx is close in value to Tirr(H) (the irreversibility line of the material). This description breaks down in the vicinity of the ''butterfly'' peak. We observed two power-law regimes of J dependence of Ueff which have μ values that agree qualitatively with the theoretical predictions (=7/9 and 3/2) for a three-dimensional flux-line lattice.

Original languageEnglish
Pages (from-to)13922-13938
Number of pages17
JournalPhysical Review B
Volume48
Issue number18
DOIs
Publication statusPublished - 1993
Externally publishedYes

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Flux pinning
Magnetic hysteresis
flux pinning
Hysteresis loops
Powders
Precipitates
precipitates
Current density
Fluxes
hysteresis
Creep
Vortex flow
Activation energy
Magnetic fields
Glass
Temperature
temperature
space temperature
current density
breakdown

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Flux pinning by Y2BaCuO5 precipitates and field- and temperature-driven pinning centers in melt-powder-melt-growth processed YBa2Cu3O7. / Kung, P. J.; Maley, M. P.; McHenry, M. E.; Willis, J. O.; Murakami, Masato; Tanaka, S.

In: Physical Review B, Vol. 48, No. 18, 1993, p. 13922-13938.

Research output: Contribution to journalArticle

Kung, P. J. ; Maley, M. P. ; McHenry, M. E. ; Willis, J. O. ; Murakami, Masato ; Tanaka, S. / Flux pinning by Y2BaCuO5 precipitates and field- and temperature-driven pinning centers in melt-powder-melt-growth processed YBa2Cu3O7. In: Physical Review B. 1993 ; Vol. 48, No. 18. pp. 13922-13938.
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abstract = "Magnetic hysteresis, flux pinning, and flux creep in melt-powder-melt-growth processed YBa2Cu3O7 (Y 1:2:3) containing nominal 0, 25, and 40 mol {\%} concentration of Y2BaCuO5 (Y 2:1:1) inclusions were investigated. The strong pinning due to 2:1:1-phase precipitates in these samples allows for characterization of the hysteretic response as a function of pinning-site concentration over a large portion of magnetic-field-temperature space. We have found the following: (i) The curves of effective pinning energy Ueff versus current density J reveal a diverging behavior of Ueff(J) in the low-J regime. This supports the existence of a vortex-glass state, and is a signature of a vanishing resistance as the current density approaches zero. (ii) Both the Ueff and the J values obtained from magnetic hysteresis loops were observed to increase with Y 2:1:1 concentration. The appearance of the butterfly-shaped (or ''fishtail'') hysteresis loops indicates a Jc that is an increasing function of H (or B). Moreover, it has been demonstrated that the additional pinning leads to an increase in Ueff in an H-T region in which the butterfly is developed. The derived effective pinning energy is fit, from the instantaneous experimental relaxation data, to the relation, Ueff(J,T,H)=Ui[G(T)/Hn](Ji/J)μ, where Ui is the scale of the activation energy, G(T) =[1-(T/Tx)2]m, and Tx is close in value to Tirr(H) (the irreversibility line of the material). This description breaks down in the vicinity of the ''butterfly'' peak. We observed two power-law regimes of J dependence of Ueff which have μ values that agree qualitatively with the theoretical predictions (=7/9 and 3/2) for a three-dimensional flux-line lattice.",
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