Critical currents in Tl-2122 and Y-124 sinters under high hydrostatic pressure

• 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.

Ämnesord

NATURVETENSKAP  -- Fysik -- Den kondenserade materiens fysik (hsv//swe)

NATURAL SCIENCES  -- Physical Sciences -- Condensed Matter Physics (hsv//eng)

Nyckelord

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

Condensed matter physics

Kondenserade materiens fysik

Superconductivity

Supraledning

fysik

Physics

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