Pinning in MgB2- and YBaCuO-based superconductors: Effect of manufacturing pressure and temperature

Tatiana Prikhna, Michael Eisterer, Harald W. Weber, Wolfgang Gawalek, Xavier Chaud, Vladimir Sokolovsky, Viktor Moshchil, Artem Kozyrev, Vladimir Sverdun, Roman Kuznietsov, Tobias Habisreuther, Myroslav Karpets, Valeriy Kovylaev, Jacques Noudem, Jacques Rabier, Anne Joulain, Wilfried Goldacker, Tatiana Basyuk, Vasiliy Tkach, Jan DellithChrista Schmidt, Anton Shaternik

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

Bulk MgB2- and YBaCuO-based materials are competitive candidates for applications. The properties of both compounds can be significantly improved by high temperature-high pressure preparation methods. The transformation of grain boundary pinning to point pinning in MgB 2-based materials with increasing manufacturing temperature from 800 to 1050 Ĉ under pressures from 0.1 MPa to 2 GPa correlates well with an increase in critical current density in low and intermediate magnetic fields and with the redistribution of boron and oxygen in the material structure. As the manufacturing temperature increases (to 2 GPa), the discontinuous oxygen-enriched layers transform into distinct Mg-B-O inclusions, and the size and amount of inclusions of higher borides MgBX × > 2) are reduced. The effect of oxygen and boron redistribution can be enhanced by Ti or SiC addition. The oxygenation of melt-textured YBa-{2}\hbox{Cu}-{3}\hbox{O} 7 - \delta (MT-YBaCuO) under oxygen pressure (16 MPa) allows one to increase the oxygenation temperature from 440 Ĉ to 700-800 Ĉ, which leads to an increase of the twin density in the Y123 matrix and to a decrease of dislocations, stacking faults, and the density of microcracks, and as a result, to an increase of the critical current density, J\rm c, and the trapped magnetic field. In MT-YBaCuO, practically free form dislocations and stacking faults and with a twin density of 22-35 μm-1, J \rm c of 100 kA/cm2 (at 77 K, 0 T) has been achieved, and the importance of twins in Y123 for pinning was demonstrated experimentally.

Original languageEnglish
Article number6403528
JournalIEEE Transactions on Applied Superconductivity
Volume23
Issue number3
DOIs
StatePublished - 18 Feb 2013

Keywords

  • Critical currents
  • flux pinning
  • superconducting material growth
  • yttrium barium copper oxide and boron compounds

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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