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IV transport critical current and n number of MgB2 conductors as a function of temperature

IV transport critical current and n number of MgB2 conductors as a function of temperature
IV transport critical current and n number of MgB2 conductors as a function of temperature
IV data of MgB2 conductors were obtained over more than 3 voltage decades from 0.1 to 400 ?V/cm and currents up to 600 A, revealing the characteristic n number to increase rapidly with decreasing temperature from n=20 around 33 K to above 60 by 25 K. Constant temperature, current-voltage,(IV) characteristics of magnesium diboride conductors over a sufficient voltage range to determine n are not available in the literature and remain a serious experimental challenge. Conductors, instrumented with voltage and temperature sensors, were mounted on a cryofree, variable-temperature-controlled platform within a custom built cryostat. To achieve constant temperature measurement, the stability had to be improved by reducing the thermal path either longitudinally or laterally. Both dc current and transient measurements were implemented and refined until good agreement was obtained. At the highest stable voltage reached, for a given temperature, any further increase led to a rapid thermal propagation until the sample was fully resistive. In carbon-doped samples, the temperature-dependent transport critical current density is best described by two linear functions with different Tc’s. The lower Tc function has the steeper increase in transport critical current with decreasing temperature.
1051-8223
8001304
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Paolella, M.
80a48257-0a52-4695-bf2b-7b7948527d21
Young, E.A.
d3a881b0-a564-41f5-9843-34ae86da360f
Yang, Y.
4cac858a-e0c0-4174-a839-05ca394fc51f
Paolella, M.
80a48257-0a52-4695-bf2b-7b7948527d21

Young, E.A., Yang, Y. and Paolella, M. (2013) IV transport critical current and n number of MgB2 conductors as a function of temperature. IEEE Transactions on Applied Superconductivity, 23 (3), 8001304. (doi:10.1109/TASC.2013.2238980).

Record type: Article

Abstract

IV data of MgB2 conductors were obtained over more than 3 voltage decades from 0.1 to 400 ?V/cm and currents up to 600 A, revealing the characteristic n number to increase rapidly with decreasing temperature from n=20 around 33 K to above 60 by 25 K. Constant temperature, current-voltage,(IV) characteristics of magnesium diboride conductors over a sufficient voltage range to determine n are not available in the literature and remain a serious experimental challenge. Conductors, instrumented with voltage and temperature sensors, were mounted on a cryofree, variable-temperature-controlled platform within a custom built cryostat. To achieve constant temperature measurement, the stability had to be improved by reducing the thermal path either longitudinally or laterally. Both dc current and transient measurements were implemented and refined until good agreement was obtained. At the highest stable voltage reached, for a given temperature, any further increase led to a rapid thermal propagation until the sample was fully resistive. In carbon-doped samples, the temperature-dependent transport critical current density is best described by two linear functions with different Tc’s. The lower Tc function has the steeper increase in transport critical current with decreasing temperature.

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Published date: June 2013
Organisations: Faculty of Engineering and the Environment

Identifiers

Local EPrints ID: 359535
URI: http://eprints.soton.ac.uk/id/eprint/359535
ISSN: 1051-8223
PURE UUID: 2f376a5e-91fa-40f8-9f33-42fbf5e90731
ORCID for Y. Yang: ORCID iD orcid.org/0000-0002-3874-6735

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Date deposited: 06 Nov 2013 14:06
Last modified: 20 Jul 2019 01:21

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Contributors

Author: E.A. Young
Author: Y. Yang ORCID iD
Author: M. Paolella

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