Spin-1/2 quantum antiferromagnetic chains with tunable superexchange interactions found in BaCu2(Si1-xGex)2O7

T. Yamada, Z. Hiroi, M. Takano

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)


Synthesis, structure, and magnetic properties of a novel one-dimensional spin-1/2 quantum antiferromagnetic (AF) system BaCu2(Si1-xGex)2O7 (0≤x≤1) are reported. Contained in this system are corrugated CuO chains made of corner-sharing CuO4 squares with the dominant exchange interaction changing almost linearly between 290 K (x=0) and 580 K (x=1). Anomalies in susceptibility and specific heat, indicative of the occurrence of a long-range AF ordering, are observed at 8.9 K (x=0) and 8.6 K (x=1). A rich magnetic phase diagram results from this strong composition dependence combined with the switching of the interchain interaction changing from ferromagnetic (x=0) to AF (x=1).

Original languageEnglish
Pages (from-to)101-109
Number of pages9
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - 2001
Externally publishedYes


  • BaCu(SiGe)O
  • Corner-sharing CuO squares
  • Dzyaloshinsky - Moriya interaction
  • Heisenberg antiferromagnetic chains
  • Superexchange interactions

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry


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