Evidence for high intergranular current flow in single phase polycrystalline MgB2 superconductor

Kenji Kawano; John Abell; M Kambara; E Hari Babu; DA Cardwell

doi:10.1063/1.1405807

Evidence for high intergranular current flow in single phase polycrystalline MgB2 superconductor

Kenji Kawano, John Abell, M Kambara, E Hari Babu, DA Cardwell

Metallurgy and Materials

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16 Citations (Scopus)

Abstract

The distribution of a magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a magneto-optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an intergranular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries are observed to resist preferential magnetic-field penetration and the persistent current has an intergranular character at temperatures up to 30 K. The results provide clear evidence that the intragranular current flow is isotropic. A critical current density of approximate to 10(4) Acm(-2) was estimated at 30 K in a field of 150 mT from the magnetic-field gradient using the standard Bean model. These results provide further evidence of the considerable potential for MgB2 for engineering applications. (C) 2001 American Institute of Physics.

Original language	English
Pages (from-to)	2216-2218
Number of pages	3
Journal	Applied Physics Letters
Volume	79
Issue number	14
DOIs	https://doi.org/10.1063/1.1405807
Publication status	Published - 1 Jan 2001

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title = "Evidence for high intergranular current flow in single phase polycrystalline MgB2 superconductor",

abstract = "The distribution of a magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a magneto-optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an intergranular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries are observed to resist preferential magnetic-field penetration and the persistent current has an intergranular character at temperatures up to 30 K. The results provide clear evidence that the intragranular current flow is isotropic. A critical current density of approximate to 10(4) Acm(-2) was estimated at 30 K in a field of 150 mT from the magnetic-field gradient using the standard Bean model. These results provide further evidence of the considerable potential for MgB2 for engineering applications. (C) 2001 American Institute of Physics.",

author = "Kenji Kawano and John Abell and M Kambara and {Hari Babu}, E and DA Cardwell",

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T1 - Evidence for high intergranular current flow in single phase polycrystalline MgB2 superconductor

AU - Kawano, Kenji

AU - Abell, John

AU - Kambara, M

AU - Hari Babu, E

AU - Cardwell, DA

PY - 2001/1/1

Y1 - 2001/1/1

N2 - The distribution of a magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a magneto-optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an intergranular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries are observed to resist preferential magnetic-field penetration and the persistent current has an intergranular character at temperatures up to 30 K. The results provide clear evidence that the intragranular current flow is isotropic. A critical current density of approximate to 10(4) Acm(-2) was estimated at 30 K in a field of 150 mT from the magnetic-field gradient using the standard Bean model. These results provide further evidence of the considerable potential for MgB2 for engineering applications. (C) 2001 American Institute of Physics.

AB - The distribution of a magnetic field in single-phase polycrystalline bulk MgB2 has been measured using a magneto-optical (MO) technique for an external magnetic field applied perpendicular to the sample surface. The MO studies indicate that an intergranular current network is readily established in this material and the current is not limited by weak-linked grain boundaries. The grain boundaries are observed to resist preferential magnetic-field penetration and the persistent current has an intergranular character at temperatures up to 30 K. The results provide clear evidence that the intragranular current flow is isotropic. A critical current density of approximate to 10(4) Acm(-2) was estimated at 30 K in a field of 150 mT from the magnetic-field gradient using the standard Bean model. These results provide further evidence of the considerable potential for MgB2 for engineering applications. (C) 2001 American Institute of Physics.

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DO - 10.1063/1.1405807

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JO - Applied Physics Letters

JF - Applied Physics Letters

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Evidence for high intergranular current flow in single phase polycrystalline MgB2 superconductor

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