La4Cu3MoO12: A novel cuprate with unusual magnetism

Douglas A. Vander Griend, Sophie Boudin, Vincent Caignaert, Kenneth R Poeppelmeier, Yanguo Wang, Vinayak P. Dravid, Masaki Azuma, Mikio Takano, Zhongbo Hu, James D. Jorgensen

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Abstract

La4Cu3MoO12 is a new (ABO3)(n=4) cuprate with mixed B-cations in a ratio of 1:3. When synthesized at ambient pressure, the structure is not perovskite as expected but rather a homeotype of YAlO3, a rare-earth hexagonal phase. While the P63/mmc and Pmnm space groups can be used to model average structures which appear in quenched samples; powder, electron, and neutron diffraction data all confirm that a slow-cooled sample crystallizes in the monoclinic space group, P1121/m. The copper and molybdenum are coordinated by oxygen in corner-sharing trigonal bipyramids that are sandwiched between layers of lanthanum cations. In the B-cation layer, the copper cations order into a kagome-like lattice of triangular clusters. The magnetism has been measured from 2 to 800 K and is highly influenced by the geometric arrangement of the Cu(II) cations. An antiferromagnetic transition occurs at 5 K, but the sample does not reach a purely paramagnetic state until 460 K.

Original languageEnglish
Pages (from-to)4787-4792
Number of pages6
JournalJournal of the American Chemical Society
Volume121
Issue number20
DOIs
Publication statusPublished - May 26 1999

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ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Vander Griend, D. A., Boudin, S., Caignaert, V., Poeppelmeier, K. R., Wang, Y., Dravid, V. P., Azuma, M., Takano, M., Hu, Z., & Jorgensen, J. D. (1999). La4Cu3MoO12: A novel cuprate with unusual magnetism. Journal of the American Chemical Society, 121(20), 4787-4792. https://doi.org/10.1021/ja984436e