Superconducting properties of single-crystal Bi-Sr-Ca-Cu-O compounds.

NEW SUPERCONDUCTING OXIDES IN THE Bi-Sr-Ca-Cu-O SYSTEM : MAGNETIC MEASUREMENTS AND STRUCTURAL DETERMINATION

-Detailed neutron diffraction structure analysis of Bi2SrzCaCu20s is reported. The effects of Pb-substitution on BizSrzCaCuzOs and Bi2Sr2CuOs are discussed, and magnetization measurement results on the 110 K phase in the Bi-Sr-Ca-Cu-0 system are given. Since the discovery of high Tc superconductivity in the Bi-Sr-Ca-Cu-0 system [I], two superconducting phases have been unambiguously identified,...

بررسی تاثیر سرب و زمان پخت برروی خواص ابررسانای سرامیکی Bi-Sr-Ca-Cu-O

Processing of Bi–Sr–Ca–Cu–O glasses using platinum and alumina crucibles

Reactions with alumina and platinum crucibles were studied during the preparation of Bi2Sr2Ca1Cu2Oy “2212” glasses. In particular, reactions with Al2O3 are of interest since alumina is a potential substrate material in applications of this superconductor. Glasses processed using alumina crucibles were completely homogeneous and free of secondary phases although the material contained 2.26 at. %...

Preparation and Properties of High-T c Bi-Pb-Sr-Ca-Cu-O Thick Film Superconductors on YSZ Substrates

An evaluation of four firing profiles was performed to determine the optimum processing conditions for producing high-T c Bil.8Pb0.33Srl.87Ca2Cu30 x thick films on yttriastabilized zirconia substrates. Using these four profiles, the effects of sintering temperatures of 830-850°C and soak times of 0.5 to 12 hours were examined. In this study, Tc,zero values of 100K were obtained using a firing p...

First Scanning Tunnelling Spectroscopy on Bi 2 Sr 2 Ca 2 Cu 3 O 10 + δ single crystals

We report the first low temperature scanning tunnelling microscopy and spec-troscopy study of high quality Bi 2 Sr 2 Ca 2 Cu 3 O 10+δ crystals. We present atomic resolution and show spectroscopic data acquired on two different samples. In one case, for T c = 109 K and a transition width of only 1 K, we obtained an extremely homogeneous sample with ∆ p = 60 meV over at least 50 nm. In the other ...