Spin-1/2 Heisenberg antiferromagnetic chains in the frustrated spinel lattice of GeCu2O4

Takahiro Yamada, Zenji Hiroi, Mikio Takano, Minoru Nohara, Hidenori Takagi

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

One-dimensional quantum antiferromagnetism has been found in a tetragonal spinel oxide, GeCu2O4. Actually the temperature dependence of magnetic susceptibility exhibiting a broad maximum around 80 K can be well-described as that of S = 1/2 Heisenberg antiferromagnetic chains with J/kB = 135 K. Cooperation of spin frustration caused by the triangular arrangement of the cupric ions at octahedral sites and the Jahn-Teller elongation of the CuO6 octahedra along the c axis seems to lead to the formation of magnetically isolated CuO2 chains made of edge-sharing CuO4 squares. However, a small drop in susceptibility and also a sharp spike in specific heat suggesting the occurrence of long-range antiferromagnetic ordering are observed at 33 K. The effects of Si-for-Ge substitution and Mg-for-Cu substitution are also reported.

Original languageEnglish
Pages (from-to)1477-1483
Number of pages7
Journaljournal of the physical society of japan
Volume69
Issue number5
DOIs
Publication statusPublished - 2000 May
Externally publishedYes

Keywords

  • Edge-sharing CuO chains
  • Frustration
  • GeCuO
  • Heisenberg antiferromagnetic chains
  • Spinel lattice

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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