Superconducting properties of nanocrystalline MgB2 thin films made by an in situ annealing process

X. H. Zeng; A. Sukiasyan; X. X. Xi; Y. F. Hu; E. Wertz; Qi Li; W. Tian; H. P. Sun; X. Q. Pan; J. Lettieri; D. G. Schlom; C. O. Brubaker; Zi Kui Liu; Qiang Li

doi:10.1063/1.1405431

Superconducting properties of nanocrystalline MgB₂ thin films made by an in situ annealing process

X. H. Zeng, A. Sukiasyan, X. X. Xi, Y. F. Hu, E. Wertz, Qi Li, W. Tian, H. P. Sun, X. Q. Pan, J. Lettieri, D. G. Schlom, C. O. Brubaker, Zi Kui Liu, Qiang Li

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Abstract

We have studied the structural and superconducting properties of MgB₂ thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB₂ with very small grain sizes. A zero-resistance transition temperature (T_c0) of 34 K and a zero-field critical current density (J_c) of 1.3 × 10⁶ A/cm² were obtained. The irreversibility field was ∼8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB₂ Josephson junction technologies.

Original language	English (US)
Pages (from-to)	1840-1842
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	12
DOIs	https://doi.org/10.1063/1.1405431
State	Published - Sep 17 2001

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1063/1.1405431

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title = "Superconducting properties of nanocrystalline MgB2 thin films made by an in situ annealing process",

abstract = "We have studied the structural and superconducting properties of MgB2 thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature (Tc0) of 34 K and a zero-field critical current density (Jc) of 1.3 × 106 A/cm2 were obtained. The irreversibility field was ∼8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB2 Josephson junction technologies.",

author = "Zeng, {X. H.} and A. Sukiasyan and Xi, {X. X.} and Hu, {Y. F.} and E. Wertz and Qi Li and W. Tian and Sun, {H. P.} and Pan, {X. Q.} and J. Lettieri and Schlom, {D. G.} and Brubaker, {C. O.} and Liu, {Zi Kui} and Qiang Li",

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TY - JOUR

T1 - Superconducting properties of nanocrystalline MgB2 thin films made by an in situ annealing process

AU - Zeng, X. H.

AU - Sukiasyan, A.

AU - Xi, X. X.

AU - Hu, Y. F.

AU - Wertz, E.

AU - Li, Qi

AU - Tian, W.

AU - Sun, H. P.

AU - Pan, X. Q.

AU - Lettieri, J.

AU - Schlom, D. G.

AU - Brubaker, C. O.

AU - Liu, Zi Kui

AU - Li, Qiang

PY - 2001/9/17

Y1 - 2001/9/17

N2 - We have studied the structural and superconducting properties of MgB2 thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature (Tc0) of 34 K and a zero-field critical current density (Jc) of 1.3 × 106 A/cm2 were obtained. The irreversibility field was ∼8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB2 Josephson junction technologies.

AB - We have studied the structural and superconducting properties of MgB2 thin films made by pulsed-laser deposition followed by in situ annealing. The cross-sectional transmission electron microscopy reveals a nanocrystalline mixture of textured MgO and MgB2 with very small grain sizes. A zero-resistance transition temperature (Tc0) of 34 K and a zero-field critical current density (Jc) of 1.3 × 106 A/cm2 were obtained. The irreversibility field was ∼8 T at low temperatures, although severe pinning instability was observed. The result is a step towards making the in situ deposition process a viable technique for MgB2 Josephson junction technologies.

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JO - Applied Physics Letters

JF - Applied Physics Letters

IS - 12

ER -

Superconducting properties of nanocrystalline MgB₂ thin films made by an in situ annealing process

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