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

โœ Scribed by R.J. Cava; T. Siegrist; B. Hessen; J.J. Krajewski; W.F. Peck Jr.; B. Batlogg; H. Takagi; J.V. Waszczak; L.F. Schneemeyer; H.W. Zandbergen

Publisher
Elsevier Science
Year
1991
Tongue
English
Weight
607 KB
Volume
177
Category
Article
ISSN
0921-4534

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โœฆ Synopsis

The synthesis and structural characterization of a new type of homologous series of lanthanum cuprates, with the general formula La4+4nCu8+2n014+8nr is reported. Tlfe n = 2 and n = 3 members, La2Cu20, and La&u , 19, synthesized in bulk, are stable 0 over very narrow temperature ranges in air and oxygen. Higher members (n > 3 ) have been observed by electron microscopy. The crystal structure of La2CuZ05 consists of thin slabs of LaaCuO~ sandwiched between CuO planes of complex low-dimensional geometry. The temperature dependent magnetic susceptibilities of LaZCu205 and La8Cu,01s are characteristic of low-dimensional Heisenberg antiferromagnets with a remarkably low exchange coupling energy.

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