Synthesis and magnetic property of Cu2GeO4 containing edge-sharing CuO2 chains

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

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

Polycrystals of Cu2GeO4 have been synthesized under high pressure (4 GPa) and high temperature (900°C) conditions. It has the tetragonally distorted spinel structure with CuO6 octahedra elongated along the c axis due to the Jahn-Teller effect. The crystal structure is apparently three-dimensional, but the major superexchange path is assumed to be one-dimensional along the edge sharing chains. In fact, the magnetic susceptibility of Cu2GeO4 shows a broad maximum around 100 K and is well described as that of the S=1/2 Heisenberg antiferromagnetic chains with interaction J of 135 K. A small jump in the susceptibility curve is observed at 33 K, which is considered to be a sign of antiferromagnetic ordering. Moreover, specific heat measurements show a large sharp peak at the same temperature, suggesting a first-order phase transition. The effects of Mg substitution for Cu and Si substitution for Ge are also reported.

Original languageEnglish
Pages (from-to)1136-1141
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume45
Issue number12
DOIs
Publication statusPublished - 1998 Dec
Externally publishedYes

Keywords

  • CuGeO
  • Edge-Sharing CuO Chains
  • S=1/2 Heisenberg antiferromagnetic chains

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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