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X-Ray Single Crystal Structure Analysis of the Three-Leg-Ladder Compound (Sr, Ca)4Cu6O10

1997; Elsevier BV; Volume: 134; Issue: 2 Linguagem: Inglês

10.1006/jssc.1997.7716

1095-726X

H. Schwer, E.M. Kopnin, J. Jun, J. Karpiński,

Magnetic and transport properties of perovskites and related materials

Crystals with the general formula Srn−1Cun+1O2nbelong to the "ladder" compounds, a new series of high-pressure materials. They are expected to have interesting magnetic properties and are possible candidates for HTcsuperconductors. For the first time single crystals of (Sr, Ca)4Cu6O10have been grown using a high-Ar-gas-pressure method. A crystal was measured on an X-ray four circle single crystal diffractometer and the structure was refined toR=0.056 withFdata andwR=0.094 withF2data. (Sr, Ca)4Cu6O10crystallizes with space group No. 65Cmmm(Z=1) and has lattice parametersa=3.9299(5) Å,b=19.392(3) Å,c=3.4358(5) Å. The Ca content at the Sr site was refined to 4.3(8)%. The crystal structure consists of layers with coupled chains formed by both edge- and corner-sharing CuO4units ("ladders") separated by layers of Sr/Ca atoms.