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Monoclinic symmetry in LaSrCu0.5Co0.5O4−z found by neutron, Guinier-and synchrotron-X-ray powder structure analysis

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Zeitschrift für Physik B Condensed Matter

Abstract

High resolution X-ray and neutron powder diffraction data of semiconducting LaSrCu0.5Co0.5O3.7 have been collected in the temperature range of 5 to 300 K. A monoclinic structure with space groupI 2/m a=3.7952(1) Å,b=3.7902(1) Å,c=12.6507(1) Å, γ=90.074(1) Deg was refined with the Rietveld method for individual data sets as well as for the collection of all data simultaneously. The structureI 2/m results from an internal shearing of the octahedra and-unlikeCmca in superconducting La1.85Sr0.15CuO4-not from a second order phase transition inI4/mmm. An alternative model with two tetragonal latticesa 1=3.7902,a 2=3.7952,c=12.6507 Å is discussed.

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Hohlwein, D., Hoser, A., Ihringer, J. et al. Monoclinic symmetry in LaSrCu0.5Co0.5O4−z found by neutron, Guinier-and synchrotron-X-ray powder structure analysis. Z. Physik B - Condensed Matter 75, 439–445 (1989). https://doi.org/10.1007/BF01312520

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  • DOI: https://doi.org/10.1007/BF01312520

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