Phase control of La2CuO4 in thin-film synthesis

Details Phase control of La2CuO4 in thin-film synthesis Phase control of La2CuO4 in thin-film synthesis

2002-09-12

arxiv.org/abs/cond-mat/0209281v1

Physics

Condensed Matter

Superconductivity

4 pages, 5 figures, submitted to PRB, revtex

Scientific paper

10.1103/PhysRevB.66.184515

The lanthanum copper oxide, La2CuO4, which is an end member of the prototype high-Tc superconductors (La,Sr)2CuO4 and (La,Ba)2CuO4, crystallizes in the "K2NiF4" structure in high-temperature bulk synthesis. The crystal chemistry, however, predicts that La2CuO4 is at the borderline of the K2NiF4 stability and that it can crystallize in the Nd2CuO4 structure at low synthesis temperatures. In this article we demonstrate that low-temperature thin-film synthesis actually crystallizes La2CuO4 in the Nd2CuO4 structure. We also show that the phase control of "K2NiF4"-type La2CuO4 versus "Nd2CuO4"-type La2CuO4 can be achieved by varying the synthesis temperature and using different substrates.

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