Superconductivity in MgB2 doped with Ti and C

R. H.T. Wilke; S. L. Bud'Ko; P. C. Canfield; M. J. Kramer; Y. Q. Wu; D. K. Finnemore; R. J. Suplinskas; J. V. Marzik; S. T. Hannahs

doi:10.1016/j.physc.2004.11.022

Superconductivity in MgB₂ doped with Ti and C

R. H.T. Wilke, S. L. Bud'Ko, P. C. Canfield, M. J. Kramer, Y. Q. Wu, D. K. Finnemore, R. J. Suplinskas, J. V. Marzik, S. T. Hannahs

Research and Economic Development

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Abstract

Measurements of the superconducting upper critical field, H_c2, and critical current density, J_c, have been carried out for MgB ₂ doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB₂ lattice and apparently shortens the electronic mean free path of MgB₂ and raising H_c2. Titanium forms precipitates of either TiB or TiB ₂ that enhance the flux pinning and raise J_c. Most of these precipitates are intra-granular in the MgB₂ phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB₂ lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB₂, the resulting superconductor has μ₀H _c2(T = 0) ∼ 25 T and J_c ∼ 10,000 A/cm² at 5 K and 2.2 T.

Original language	English
Pages (from-to)	160-167
Number of pages	8
Journal	Physica C: Superconductivity and its Applications
Volume	418
Issue number	3-4
DOIs	https://doi.org/10.1016/j.physc.2004.11.022
State	Published - 1 Feb 2005

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title = "Superconductivity in MgB2 doped with Ti and C",

abstract = "Measurements of the superconducting upper critical field, Hc2, and critical current density, Jc, have been carried out for MgB 2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB2 lattice and apparently shortens the electronic mean free path of MgB2 and raising Hc2. Titanium forms precipitates of either TiB or TiB 2 that enhance the flux pinning and raise Jc. Most of these precipitates are intra-granular in the MgB2 phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB2 lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB2, the resulting superconductor has μ0H c2(T = 0) ∼ 25 T and Jc ∼ 10,000 A/cm2 at 5 K and 2.2 T.",

author = "Wilke, {R. H.T.} and Bud'Ko, {S. L.} and Canfield, {P. C.} and Kramer, {M. J.} and Wu, {Y. Q.} and Finnemore, {D. K.} and Suplinskas, {R. J.} and Marzik, {J. V.} and Hannahs, {S. T.}",

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T1 - Superconductivity in MgB2 doped with Ti and C

AU - Wilke, R. H.T.

AU - Bud'Ko, S. L.

AU - Canfield, P. C.

AU - Kramer, M. J.

AU - Wu, Y. Q.

AU - Finnemore, D. K.

AU - Suplinskas, R. J.

AU - Marzik, J. V.

AU - Hannahs, S. T.

PY - 2005/2/1

Y1 - 2005/2/1

N2 - Measurements of the superconducting upper critical field, Hc2, and critical current density, Jc, have been carried out for MgB 2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB2 lattice and apparently shortens the electronic mean free path of MgB2 and raising Hc2. Titanium forms precipitates of either TiB or TiB 2 that enhance the flux pinning and raise Jc. Most of these precipitates are intra-granular in the MgB2 phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB2 lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB2, the resulting superconductor has μ0H c2(T = 0) ∼ 25 T and Jc ∼ 10,000 A/cm2 at 5 K and 2.2 T.

AB - Measurements of the superconducting upper critical field, Hc2, and critical current density, Jc, have been carried out for MgB 2 doped with Ti and/or C in order to explore the problems encountered if these dopants are used to enhance the superconducting performance. Carbon replaces boron on the MgB2 lattice and apparently shortens the electronic mean free path of MgB2 and raising Hc2. Titanium forms precipitates of either TiB or TiB 2 that enhance the flux pinning and raise Jc. Most of these precipitates are intra-granular in the MgB2 phase. For samples containing both C and Ti doping, the C appears to still replace B in the MgB2 lattice and the Ti precipitates out as a boride. If approximately 0.5%Ti and approximately 2%C are co-deposited with B to form doped boron fibers and these fibers are in turn reacted in Mg vapor to form doped MgB2, the resulting superconductor has μ0H c2(T = 0) ∼ 25 T and Jc ∼ 10,000 A/cm2 at 5 K and 2.2 T.

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DO - 10.1016/j.physc.2004.11.022

M3 - Article

AN - SCOPUS:12344261035

SN - 0921-4534

VL - 418

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EP - 167

JO - Physica C: Superconductivity and its Applications

JF - Physica C: Superconductivity and its Applications

IS - 3-4

ER -

Superconductivity in MgB₂ doped with Ti and C

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