Control of superconductivity in MgB2 by ion bombardment

A. A. Baker; L. B. Bayu Aji; J. H. Bae; E. Stavrou; J. L. Beckham; S. K. McCall; S. O. Kucheyev

doi:10.1088/1361-6463/ab1e2e

Control of superconductivity in MgB₂ by ion bombardment

A. A. Baker^*, L. B. Bayu Aji, J. H. Bae, E. Stavrou, J. L. Beckham, S. K. McCall, S. O. Kucheyev

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

The superconducting properties of MgB₂ can be modified via controlled introduction of lattice defects by ion bombardment. Here, magnetometry and Raman spectroscopy are used to study ∼160 nm-thick MgB₂ films bombarded at room temperature with megaelectronvolt-energy He, Ar, or Xe ions. Ion bombardment leads to a monotonic reduction in the critical superconducting transition temperature, transition width, and critical current density. There is a clear collision cascade density effect, whereby radiation-induced changes, once normalized to the number of atomic displacements generated, are greater for heavier ions. The sharpening of the superconducting transition with increasing ion dose suggests improved homogeneity of irradiated films. The suppression of superconducting properties correlates with the growth of defect signatures revealed by Raman spectroscopy. Superconducting properties can be recovered by annealing at relatively low temperatures of 500 °C, even for films exposed to high doses of heavy ions. These results have direct implications for the performance of MgB₂ in radiation environments and understanding its defect-mediated superconductivity.

Original language	English
Article number	295302
Journal	Journal Physics D: Applied Physics
Volume	52
Issue number	29
DOIs	https://doi.org/10.1088/1361-6463/ab1e2e
State	Published - 20 May 2019
Externally published	Yes

Keywords

ion bombardment
levitation
magnesium diboride
superconductivity
thin film superconductor

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10.1088/1361-6463/ab1e2e

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title = "Control of superconductivity in MgB2 by ion bombardment",

abstract = "The superconducting properties of MgB2 can be modified via controlled introduction of lattice defects by ion bombardment. Here, magnetometry and Raman spectroscopy are used to study ∼160 nm-thick MgB2 films bombarded at room temperature with megaelectronvolt-energy He, Ar, or Xe ions. Ion bombardment leads to a monotonic reduction in the critical superconducting transition temperature, transition width, and critical current density. There is a clear collision cascade density effect, whereby radiation-induced changes, once normalized to the number of atomic displacements generated, are greater for heavier ions. The sharpening of the superconducting transition with increasing ion dose suggests improved homogeneity of irradiated films. The suppression of superconducting properties correlates with the growth of defect signatures revealed by Raman spectroscopy. Superconducting properties can be recovered by annealing at relatively low temperatures of 500 °C, even for films exposed to high doses of heavy ions. These results have direct implications for the performance of MgB2 in radiation environments and understanding its defect-mediated superconductivity.",

keywords = "ion bombardment, levitation, magnesium diboride, superconductivity, thin film superconductor",

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note = "Publisher Copyright: {\textcopyright} 2019 IOP Publishing Ltd.",

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doi = "10.1088/1361-6463/ab1e2e",

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T1 - Control of superconductivity in MgB2 by ion bombardment

AU - Baker, A. A.

AU - Bayu Aji, L. B.

AU - Bae, J. H.

AU - Stavrou, E.

AU - Beckham, J. L.

AU - McCall, S. K.

AU - Kucheyev, S. O.

PY - 2019/5/20

Y1 - 2019/5/20

N2 - The superconducting properties of MgB2 can be modified via controlled introduction of lattice defects by ion bombardment. Here, magnetometry and Raman spectroscopy are used to study ∼160 nm-thick MgB2 films bombarded at room temperature with megaelectronvolt-energy He, Ar, or Xe ions. Ion bombardment leads to a monotonic reduction in the critical superconducting transition temperature, transition width, and critical current density. There is a clear collision cascade density effect, whereby radiation-induced changes, once normalized to the number of atomic displacements generated, are greater for heavier ions. The sharpening of the superconducting transition with increasing ion dose suggests improved homogeneity of irradiated films. The suppression of superconducting properties correlates with the growth of defect signatures revealed by Raman spectroscopy. Superconducting properties can be recovered by annealing at relatively low temperatures of 500 °C, even for films exposed to high doses of heavy ions. These results have direct implications for the performance of MgB2 in radiation environments and understanding its defect-mediated superconductivity.

AB - The superconducting properties of MgB2 can be modified via controlled introduction of lattice defects by ion bombardment. Here, magnetometry and Raman spectroscopy are used to study ∼160 nm-thick MgB2 films bombarded at room temperature with megaelectronvolt-energy He, Ar, or Xe ions. Ion bombardment leads to a monotonic reduction in the critical superconducting transition temperature, transition width, and critical current density. There is a clear collision cascade density effect, whereby radiation-induced changes, once normalized to the number of atomic displacements generated, are greater for heavier ions. The sharpening of the superconducting transition with increasing ion dose suggests improved homogeneity of irradiated films. The suppression of superconducting properties correlates with the growth of defect signatures revealed by Raman spectroscopy. Superconducting properties can be recovered by annealing at relatively low temperatures of 500 °C, even for films exposed to high doses of heavy ions. These results have direct implications for the performance of MgB2 in radiation environments and understanding its defect-mediated superconductivity.

KW - ion bombardment

KW - levitation

KW - magnesium diboride

KW - superconductivity

KW - thin film superconductor

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DO - 10.1088/1361-6463/ab1e2e

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SN - 0022-3727

VL - 52

JO - Journal Physics D: Applied Physics

JF - Journal Physics D: Applied Physics

IS - 29

M1 - 295302

ER -

Control of superconductivity in MgB₂ by ion bombardment

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Keywords

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