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Preparation and magnetic properties of Pb2Sr2Y1−xCaxCu3O8+δ

✍ Scribed by J. Lethen; H. Frank; L. Winkeler; G. Güntherodt

Publisher
Elsevier Science
Year
1994
Tongue
English
Weight
134 KB
Volume
235-240
Category
Article
ISSN
0921-4534

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✦ Synopsis

Polycrystalline Pb2Sr2Yl_xCaxCu3Os+ 8 (PSYCCO) samples have been prepared without precursor (x=0.3-0.6). The samples exhibit a metallic normal-state conductivity, and the highest To(R=0 ) achieved is 70K. Regarding anisotropy, SQUID-magnetometry demonstrates the intermediate position of PSYCCO between YBCO and Bi-2223. The critical current density (Jc=10SAcm -2 at 50K for H=lkOe) shows for 0.2 <T/T c <0.7 a flatter temperature dependence compared to polycrystalline Bi-2223. In fields of H=10kOe, the irreversibility line (Tirr/T c =0.6) is shifted to higher temperatures compared to Bi-2212

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Structural changes and oxygen stoichiome
Structural changes and oxygen stoichiometry in Pb2Sr2Y1−xCaxCu3O8+δ
✍ J.J. Capponi; P. Bordet; C. Chaillout; J. Chenavas; O. Chmaissem; E.A. Hewat; J. 📂 Article 📅 1989 🏛 Elsevier Science 🌐 English ⚖ 247 KB

We have prepared several samples of Pb2Sr2Yl-xCaxCu308+O with various well defined oxygen contents and studied their oxidation process by TGA and characterized them by X-ray and electron diffraction. For x = 0 the upper limit for ~ is found to be 1.9. We show that the oxidation process is accompanie