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Oxygen nonstoichiometry and metal substitution in TlSr2CaCu2O7−z

✍ Scribed by F. Izumi; T. Kondo; Y. Shimakawa; T. Manako; Y. Kubo; H. Igarashi; H. Asano

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
163 KB
Volume
185-189
Category
Article
ISSN
0921-4534

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✦ Synopsis

The structure parameters of superconducting and nonsupereonducting TISr2CaCu2OT-z were refined using neutronpowder-diffraction data on the basis of P4/mmm space group. Ald site of oxygen on a TIO sheet is considerably deficient even in the oxygen-rich nonsuperconducting sample; the occupation factor of this site was refined to be 0.88. It decreases to 0.80 in the superconducting sample with a Tc of 58 K. That is, the change in oxygen content and the corresponding one in hole concentration are caused by incorporation and release of oxygen atoms on the TIO sheets. The present refinements also show that a Ca site is about 12% substituted by TI.

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✍ Y. Shimakawa; J.D. Jorgensen; B.A. Hunter; H. Shaked; R.L. Hitterman; Y. Kubo; T 📂 Article 📅 1995 🏛 Elsevier Science 🌐 English ⚖ 607 KB

The effects of pressure on T c and structure in overdoped T1Sr2CaCu20 7\_ 6 have been investigated. For superconducting samples dTc/d p is small and negative with din Told p varying from -0.016 GPa -l to -0.006 GPa -l. There is no significant difference in the lattice compressibilities for supercond