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Magnetic Properties of YBCO-PST Composites

100%

Andrzejewski B., Kaczmarek A., Stankowski J., Hilczer B., Marfaing J., Régnier S., Caranoni C.

Acta Physica Polonica A

2000

vol. 98

issue 6

739-746

The magnetic properties of granular superconductor-insulator composites were investigated. The composites were random composition of the YBa_{2}Cu_{3}O_{7-δ} (YBCO) high-temperature superconductor and Pb(Sc_{0.5}Ta_{0.5})O_{3} (PST) ferroelectric insulator. The composites exhibited lower superconducting volume ratio than the YBCO content. For samples with YBCO content low enough no global (the whole sample) and local (separated grains) superconductivity was observed. The observed decay of the superconductivity, lowering of the critical temperature, and the increase in number of paramagnetic centres as PST content increases are explained assuming reaction among YBCO and PST phases and possible formation of an additional ones, which did not exist in the initial powders.

High-Pressure Microwave Study of YBa_{2}Cu_{3}O_{7-δ}-Pb(Sc_{0.5}Ta_{0.5})O_{3} Composite

84%

Czyżak B., Stankowski J., Hilczer B., Krupski M., Morawski P., Andrzejewski B., Marfaing J., Régnier S., Caranoni C.

Acta Physica Polonica A

1997

vol. 91

issue 6

1103-1109

The ferroelectric relaxor Pb(Sc_{0.5}Ta_{0.5})O_{3}-superconductor YBa_{2}Cu_{3}O_{7-δ} 50% in weight composite exhibits the onset critical temperature T_{c}=95 K. High pressure studies yield the factor dT_{c}/dp of 1.0 K/GPa, close to the value observed for a pure YBa_{2}Cu_{3}O_{7-δ} compound. The microwave absorption studies show the significant role of the intergrain weak links.

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2 Acta Physica Polonica A

1 2000

1 1997

2 Andrzejewski B.

2 Caranoni C.

2 Hilczer B.

2 Marfaing J.

2 Régnier S.

2 Stankowski J.

1 Czyżak B.

1 Kaczmarek A.

1 Krupski M.

1 Morawski P.

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Magnetic Properties of YBCO-PST Composites

High-Pressure Microwave Study of YBa_{2}Cu_{3}O_{7-δ}-Pb(Sc_{0.5}Ta_{0.5})O_{3} Composite