Structure-Property Relationships in the Layered Cuprate La2-xSrxCuSnO6

✍ Scribed by Mark T. Anderson; Kenneth R. Poeppelmeier; Stephen A. Gramsch; Jeremy K. Burdett

• Book ID: 102601862
• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 419 KB
• Volume: 102
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1993.1019

✦ Synopsis

In an attempt to induce a metallic or superconductive state in the layered cuprate (\mathrm{La}{2} \mathrm{CuSnO}{6}), the series (\mathrm{La}{2-x} \mathrm{Sr}{x} \mathrm{CuSnO}_{6-r / 2+\delta}(x=0.00,0.05,0.10,0.125,0.15,0.175,0.20)) was prepared. A solid solution forms for (0.00<x<0.175), the overall oxygen content is 6.00 (3), and the samples are antiferromagnetic semiconductors. From neutron diffraction experiments, the compounds possess distinct copper-oxygen and tin-oxygen layers. There is a mismatch at the interface of the layers, which results in expansion of the copper-oxygen bond lengths (1.99 (\AA) average). The copper is oxidized upon addition of strontium; however, in contrast to (p)-type cuprate superconductors, the in-plane copper-oxygen bond lengths increase and the axial bonds decrease. The interleaved tin-oxygen layers have a dramalic effect on the crystal chemistry, electronic structure, and properties. The electronic consequence is that empty upper and filled lower (d x^{2}-y^{2}) bands (upper and lower Hubbard bands) remain separated and narrow upon oxidation, which presumably prohibits superconductivity. (0) 1993

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