Enhancement of critical current density in bulk superconductor by doping

Y. Zhao; Y. Feng; T. Machi; C. H. Cheng; D. X. Huang; Y. Fudamoto; N. Koshizuka; M. Murakami

doi:10.1209/epl/i2002-00479-1

All issues

Volume 57 / No 3 (February 2002)

Europhys. Lett., 57 3 (2002) 437-443

Abstract

Issue		Europhys. Lett. Volume 57, Number 3, February 2002


Page(s)		437 - 443
Section		Condensed matter: electronic structure, electrical, magnetic, and optical properties
DOI		https://doi.org/10.1209/epl/i2002-00479-1
Published online		01 September 2002

Europhys. Lett., 57 (3), pp. 437-443 (2002)

Enhancement of critical current density in $\chem{MgB_{2}}$ bulk superconductor by $\chem{Ti}$ doping

Y. Zhao¹^,2, Y. Feng¹, T. Machi¹, C. H. Cheng², D. X. Huang¹, Y. Fudamoto¹, N. Koshizuka¹ and M. Murakami¹

¹ Superconductivity Research Laboratory, ISTEC 1-10-13 Shinonome, Koto-ku, Tokyo 135, Japan
² Superconductivity Research Group, School of Materials Science and Engineering University of New South Wales - Sydney, 2052 NSW, Australia

Corresponding author: zhao@istec.or.jp

Received: 12 July 2001
Accepted: 12 November 2001

Abstract

We studied the $\chem{Ti}$ doping effect on the superconducting properties and microstructure of sintered $\chem{MgB_{2}}$ bulk polycrystals. Using $\chem{Ti}$ as a sintering assistant, we have fabricated $\chem{MgB_{2}}$ bulk materials consisting of fine 10 $\un{nm}$ scale particles and achieved a high $J_\ab{c}$ of 1 $\un{MA/cm^2}$ in self-field and $3\times10^{5}$ $\un{A/cm^2}$ in 1 $\un{T}$ at 20 $\un{K}$ . The large enhancement of $J_\ab{c}$ is explained by the excellent connection between grains and the high density of pinning centers served by both grain boundaries and $\chem{MgO}$ nanoparticles.

PACS: 74.60.Jg – Critical currents / 74.70.Ad – Metals; alloys and binary compounds (including A15, Laves phases, etc.) / 74.60.Ge – Flux pinning, flux creep, and flux-line lattice dynamics

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