✦ LIBER ✦

Critical hole density for superconductivity in Sr-containing phases related to YBa2Cu3O7: Structure, superconductivity and cation substitutions in YSr2Cu2.8Cr0.2O7

✍ Scribed by T.G.N. Babu; C. Greaves

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 451 KB
Volume: 207
Category: Article
ISSN: 0921-4534
DOI: 10.1016/0921-4534(93)90421-l

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✦ Synopsis

It is shown that the phase YSr2Cu2.aCF0.207 can be made superconducting by substitutions of either Ca at the Y site or Ba at the Sr site. The variation of Tc for Yl-yCaySr2-xBaxCu2.sCro.207 has been determined for a range ofx and y, and the superconducting properties have been correlated with structural changes determined from time-of-flight neutron powder diffraction data. The hole densities on the superconducting CuO2 layers, deduced from structural data and the oxygen content, suggest that for this system the critical hole density for superconductivity, and optimum hole density, increase significantly as the Sr:Ba ratio is raised. The relevance of this to previous discussions of the variation of Tc with composition in Y (Ba,Sr)2Cu307_~ is highlighted.

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