Low-temperature crystal and magnetic structures of the chain-ladder composite material Sr0.4Ca13.6Cu24+yO41+z: Hole redistribution and antiferromagnetic order

M. Isobe, M. Onoda, T. Ohta, F. Izumi, K. Kimoto, E. Takayama-Muromachi, A. W. Hewat, K. Ohoyama

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


The low-temperature crystal structure of a one-dimensional chain-ladder composite material Sr0.4Ca13.6Cu24+yO41+z was determined by the Rietveld analysis of neutron diffraction data using a superspace group approach. The hole distribution between the chain and ladder planes was estimated by the bond-valence sum (BVS) calculation based on Cu-O interatomic distances. The minimum of the distance between ladder-copper and chain-oxygen atoms [Cu(1)-O(3)] was revealed to expand with lowering temperature. The BVS calculation indicated that such a structural change corresponds to a redistribution of holes from the ladder to the chain and that almost all of the holes are localized in the chain below or near the Néel temperature. By assuming reasonable magnetic interactions between hole-unoccupied Cu sites on the chain plane, we propose a possible magnetic structure model taking into account the distribution of holes and observed magnetic neutron Bragg reflections. The results suggest the presence of spin dimers, spin trimers, and "lone" spins in the chain, of which the latter two have effective magnetic moments. These moments may be an origin of staggered antiferromagnetic spin modulation onto the spin-liquid state.

Original languageEnglish
Pages (from-to)11667-11676
Number of pages10
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number17
Publication statusPublished - 2000 Nov 1

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Fingerprint Dive into the research topics of 'Low-temperature crystal and magnetic structures of the chain-ladder composite material Sr<sub>0.4</sub>Ca<sub>13.6</sub>Cu<sub>24+y</sub>O<sub>41+z</sub>: Hole redistribution and antiferromagnetic order'. Together they form a unique fingerprint.

Cite this