The effect of columnar defects on the pinning properties of NdFeAsO 0.85 conglomerate particles

J. D. Moore; L. F. Cohen; Y. Yeshurun; A. D. Caplin; K. Morrison; K. A. Yates; C. M. McGilvery; J. M. Perkins; D. W. McComb; C. Trautmann; Z. A. Ren; J. Yang; W. Lu; X. L. Dong; Z. X. Zhao

doi:10.1088/0953-2048/22/12/125023

The effect of columnar defects on the pinning properties of NdFeAsO _0.85 conglomerate particles

J. D. Moore, L. F. Cohen, Y. Yeshurun, A. D. Caplin, K. Morrison, K. A. Yates, C. M. McGilvery, J. M. Perkins, D. W. McComb, C. Trautmann, Z. A. Ren, J. Yang, W. Lu, X. L. Dong, Z. X. Zhao

Department of Physics

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26 Scopus citations

Abstract

An oxypnictide superconductor NdFeAsO_0.85 sample with transition temperature of 46K was irradiated with 2GeV Ta ions at a fluence of 5 × 10¹⁰ionscm^-2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect of these defects on the irreversible magnetization in polycrystalline randomly oriented fragments was studied as a function of field angle and field sweep rate. We find that the critical current density is moderately enhanced at fields below the matching field (∼1T). The pinning enhancement is anisotropic and maximum along the defect direction at 35K, but becomes more isotropic as the temperature is decreased. The creep rate is suppressed at 35K and at fields below the matching field, indicating that the columnar defects are efficient pinning sites under these H and T conditions.

Original language	English
Article number	125023
Journal	Superconductor Science and Technology
Volume	22
Issue number	12
DOIs	https://doi.org/10.1088/0953-2048/22/12/125023
State	Published - 2009

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Moore, J. D., Cohen, L. F., Yeshurun, Y., Caplin, A. D., Morrison, K., Yates, K. A., McGilvery, C. M., Perkins, J. M., McComb, D. W., Trautmann, C., Ren, Z. A., Yang, J., Lu, W., Dong, X. L., & Zhao, Z. X. (2009). The effect of columnar defects on the pinning properties of NdFeAsO _0.85 conglomerate particles. Superconductor Science and Technology, 22(12), Article 125023. https://doi.org/10.1088/0953-2048/22/12/125023

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title = "The effect of columnar defects on the pinning properties of NdFeAsO 0.85 conglomerate particles",

abstract = "An oxypnictide superconductor NdFeAsO0.85 sample with transition temperature of 46K was irradiated with 2GeV Ta ions at a fluence of 5 × 1010ionscm-2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect of these defects on the irreversible magnetization in polycrystalline randomly oriented fragments was studied as a function of field angle and field sweep rate. We find that the critical current density is moderately enhanced at fields below the matching field (∼1T). The pinning enhancement is anisotropic and maximum along the defect direction at 35K, but becomes more isotropic as the temperature is decreased. The creep rate is suppressed at 35K and at fields below the matching field, indicating that the columnar defects are efficient pinning sites under these H and T conditions.",

author = "Moore, {J. D.} and Cohen, {L. F.} and Y. Yeshurun and Caplin, {A. D.} and K. Morrison and Yates, {K. A.} and McGilvery, {C. M.} and Perkins, {J. M.} and McComb, {D. W.} and C. Trautmann and Ren, {Z. A.} and J. Yang and W. Lu and Dong, {X. L.} and Zhao, {Z. X.}",

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doi = "10.1088/0953-2048/22/12/125023",

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Moore, JD, Cohen, LF, Yeshurun, Y, Caplin, AD, Morrison, K, Yates, KA, McGilvery, CM, Perkins, JM, McComb, DW, Trautmann, C, Ren, ZA, Yang, J, Lu, W, Dong, XL & Zhao, ZX 2009, 'The effect of columnar defects on the pinning properties of NdFeAsO _0.85 conglomerate particles', Superconductor Science and Technology, vol. 22, no. 12, 125023. https://doi.org/10.1088/0953-2048/22/12/125023

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T1 - The effect of columnar defects on the pinning properties of NdFeAsO 0.85 conglomerate particles

AU - Moore, J. D.

AU - Cohen, L. F.

AU - Yeshurun, Y.

AU - Caplin, A. D.

AU - Morrison, K.

AU - Yates, K. A.

AU - McGilvery, C. M.

AU - Perkins, J. M.

AU - McComb, D. W.

AU - Trautmann, C.

AU - Ren, Z. A.

AU - Yang, J.

AU - Lu, W.

AU - Dong, X. L.

AU - Zhao, Z. X.

PY - 2009

Y1 - 2009

N2 - An oxypnictide superconductor NdFeAsO0.85 sample with transition temperature of 46K was irradiated with 2GeV Ta ions at a fluence of 5 × 1010ionscm-2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect of these defects on the irreversible magnetization in polycrystalline randomly oriented fragments was studied as a function of field angle and field sweep rate. We find that the critical current density is moderately enhanced at fields below the matching field (∼1T). The pinning enhancement is anisotropic and maximum along the defect direction at 35K, but becomes more isotropic as the temperature is decreased. The creep rate is suppressed at 35K and at fields below the matching field, indicating that the columnar defects are efficient pinning sites under these H and T conditions.

AB - An oxypnictide superconductor NdFeAsO0.85 sample with transition temperature of 46K was irradiated with 2GeV Ta ions at a fluence of 5 × 1010ionscm-2. High resolution transmission electron microscopy study revealed that the irradiation produced columnar-like defects. The effect of these defects on the irreversible magnetization in polycrystalline randomly oriented fragments was studied as a function of field angle and field sweep rate. We find that the critical current density is moderately enhanced at fields below the matching field (∼1T). The pinning enhancement is anisotropic and maximum along the defect direction at 35K, but becomes more isotropic as the temperature is decreased. The creep rate is suppressed at 35K and at fields below the matching field, indicating that the columnar defects are efficient pinning sites under these H and T conditions.

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The effect of columnar defects on the pinning properties of NdFeAsO _0.85 conglomerate particles

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