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Critical currents in Tl-2122 and Y-124 sinters under high hydrostatic pressure
Umeå University, Faculty of Science and Technology, Physics.
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1991 (English)In: Superconductor Science and Technology, volume 4, Special Issue 1S: Proceedings of LT-19 Satellite Conference on High Temperature Superconductivity, Cambridge 1990, Bristol: Adam Hilger , 1991, S97-S99 p.Conference paper (Refereed)
Abstract [en]

Utilizing AC susceptibility measurements the authors have investigated the inter and intragranular properties of selected bulk materials under hydrostatic pressures to 3.5 GPa. A single phase Tl2CaBa2Cu2O8 sample with superconducting transition temperature Tc approximately=107 K shows a clear maximum in Tc(P) at approximately 2.2 GPa coupled with a nearly twofold increase to 3 GPa of the intergranular critical current density JcJ near Tc. The second sample, a YBa2Cu4O8 sinter, shows a large linear increase in Tc with pressure (+5.5 K/GPa) as well as a fivefold increase JcJ to 3 GPa. Applying a critical state model, the authors find that Tc(P) varies as lambda g-2(P), where lambda g is the intragranular (London) penetration depth.

Place, publisher, year, edition, pages
Bristol: Adam Hilger , 1991. S97-S99 p.
, Superconductor Science and Technology, ISSN 0953-2048 ; Volume 4, Special Issue 1S
Keyword [en]
Superconductors, superconductivity, high transition temperature superconductors, Hi-Tc, HTS, sintered ceramic, Tl-2122, Y-124, YBa2Cu4O8, critical current density, inductive measurements, high pressure, penetration depth, critical temperature
National Category
Condensed Matter Physics Condensed Matter Physics
Research subject
URN: urn:nbn:se:umu:diva-26635DOI: 10.1088/0953-2048/4/1S/018ISBN: 0-7503-0108-2OAI: diva2:273066
Editor: J. Evetts. Available from: 2009-10-20 Created: 2009-10-20 Last updated: 2010-02-02

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Sundqvist, Bertil
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