A new type of homologous series in the La-Cu-O system

R. J. Cava, T. Siegrist, B. Hessen, J. J. Krajewski, W. F. Peck, B. Batlogg, H. Takagi, J. V. Waszczak, L. F. Schneemeyer, H. W. Zandbergen

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The synthesis and structural characterization of a new type of homologous series of lanthanum cuprates, with the general formula La4+4nCu8+8nO14+8n, is reported. The n=2 and n=3 members, La2Cu2O5 and La8Cu7O19, synthesized in bulk, are stable over very narrow temperature ranges in air and oxygen. Higher members (n > 3) have been observed by electron microscopy. The crystal structure of La2Cu2O5 consists of thin slabs of La2CuO4 sandwiched between CuO planes of complex low-dimensional geometry. The temperature dependent magnetic susceptibilities of La2Cu2O5 and La8Cu7O19 are characteristic of low-dimensional Heisenberg antiferromagnets with a remarkably low exchange coupling energy.

Original languageEnglish
Pages (from-to)115-121
Number of pages7
JournalPhysica C: Superconductivity and its applications
Issue number1-3
StatePublished - 15 Jun 1991


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