S=1/2 antiferromagnetic chains and dimers on hole-doped edge-sharing CuO2 chains

Zenji Hiroi, Makoto Okumura, Takahiro Yamada, Mikio Takano

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)

Abstract

Holes doped on edge-sharing CuO2 chains are almost localized because of nearly orthogonal Cu-O-Cu bonds. Consequently, only spin degrees of freedom survive at low temperatures, which sometimes presents unusual quantum magnetism. Quasi-one-dimensional cupric oxides Ca1-xCuO2+δ and Sr14Cu24O41, both containing 25-50% hole-doped edge-sharing CuO2 chains, are studied by uniform magnetic susceptibility and specific heat measurements on a series of polycrystalline samples with controlled metal and oxygen contents. Most spins are always dimerized in Sr14Cu24O41, while, in contrast, antiferromagnetic chains made of nearly 50% spins exist with the remainder forming dimers of variable density in Ca1-xCuO2+δ. A two-sublattice model is proposed by considering that the nearest-neighbor couplings are negligibly small, due to both geometrical frustration and the special Cu-O-Cu bond angle of ∼95°.

Original languageEnglish
Pages (from-to)164-170
Number of pages7
JournalJournal of Alloys and Compounds
Volume317-318
DOIs
Publication statusPublished - 2001 Apr 12
Externally publishedYes

Keywords

  • CuO chain
  • Hole-doping
  • Quantum spin system

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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