Magnetic study in high-Tc superconducting oxides by AC-complex magnetic susceptibility

✍ Scribed by K. Okuda; S. Noguchi; M. Yoshikawa; N. Imanaka; H. Imai; G. Adachi

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 362 KB
• Volume: 165-166
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/s0921-4526(09)80284-6

✦ Synopsis

Magnetic properties of high-Tc superconducting oxides were investigated by ac-complex magnetic susceptibility X = X'-jX". The magnetic penetration depth ,,(T) obtained f 2 0m X' was analyzed by the term of BCS gap parameter.

A strong correlation between Tc and ,,(0)-was found. The loss peak of X"(T) in the bulk sample of Bi(Pb)SrCaCuO-Au composites system was measured as a function of field amplitude and frequency. The activation energy of flux was obtained as a function of field amplitude by applying the flux-creep model.

(Bi,Pb)2Sr2Ca2Cu30y-Au composites and the Auuncomposite syste~. In the Au composites the Au metal is segregated in the bubbles surrounded by the superconducting grains . Both samples have almost the same Tc ~110 K. DC critical current of Au composites is higher than that of the Au-uncomposite sample: Jc = Fig.1. The relation between Tc and ,,(0)-2 various superconducting Cu oxides. insertion is an example of ,,(T)/,,(O) (La1_xSrx)2Cu04 system.

A broken line is theoretical curve given in the text.