Thermal instability, magnetic field shielding and trapping in single-grain YBa2Cu3O7-δ bulk materials

L. Gao; Y. Y. Xue; R. L. Meng; C. W. Chu

doi:10.1063/1.111092

Thermal instability, magnetic field shielding and trapping in single-grain YBa₂Cu₃O_7-δ bulk materials

L. Gao, Y. Y. Xue, R. L. Meng, C. W. Chu

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Abstract

We report results on the temperature dependence of the trap field B _T and the thermal instability (flux jump) field H_fj in single-grain YBa₂Cu₃O_7-δ disks. Above 45 K, B_T is limited by the critical current density J_c and B_T=B_T0(1-T/T_c)^q with q≊1.67. At 4.2 K, the first flux jump field H_fj of ∼3 T is about an order of magnitude larger than theoretical prediction based on the adiabatic thermal instability model. We also find that the occurrence of large flux avalanches probably causes severe microcracking damages to the superconducting disks.

Original language	English
Pages (from-to)	520-522
Number of pages	3
Journal	Applied Physics Letters
Volume	64
Issue number	4
DOIs	https://doi.org/10.1063/1.111092
Publication status	Published - 1994

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.111092

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title = "Thermal instability, magnetic field shielding and trapping in single-grain YBa2Cu3O7-δ bulk materials",

abstract = "We report results on the temperature dependence of the trap field B T and the thermal instability (flux jump) field Hfj in single-grain YBa2Cu3O7-δ disks. Above 45 K, BT is limited by the critical current density Jc and BT=BT0(1-T/Tc)q with q≊1.67. At 4.2 K, the first flux jump field Hfj of ∼3 T is about an order of magnitude larger than theoretical prediction based on the adiabatic thermal instability model. We also find that the occurrence of large flux avalanches probably causes severe microcracking damages to the superconducting disks.",

author = "L. Gao and Xue, {Y. Y.} and Meng, {R. L.} and Chu, {C. W.}",

year = "1994",

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AU - Gao, L.

AU - Xue, Y. Y.

AU - Meng, R. L.

AU - Chu, C. W.

PY - 1994

Y1 - 1994

N2 - We report results on the temperature dependence of the trap field B T and the thermal instability (flux jump) field Hfj in single-grain YBa2Cu3O7-δ disks. Above 45 K, BT is limited by the critical current density Jc and BT=BT0(1-T/Tc)q with q≊1.67. At 4.2 K, the first flux jump field Hfj of ∼3 T is about an order of magnitude larger than theoretical prediction based on the adiabatic thermal instability model. We also find that the occurrence of large flux avalanches probably causes severe microcracking damages to the superconducting disks.

AB - We report results on the temperature dependence of the trap field B T and the thermal instability (flux jump) field Hfj in single-grain YBa2Cu3O7-δ disks. Above 45 K, BT is limited by the critical current density Jc and BT=BT0(1-T/Tc)q with q≊1.67. At 4.2 K, the first flux jump field Hfj of ∼3 T is about an order of magnitude larger than theoretical prediction based on the adiabatic thermal instability model. We also find that the occurrence of large flux avalanches probably causes severe microcracking damages to the superconducting disks.

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JF - Applied Physics Letters

IS - 4

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Thermal instability, magnetic field shielding and trapping in single-grain YBa₂Cu₃O_7-δ bulk materials

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