Effect of spin dilution on the magnetic state of delafossite CuCrO 2 with an S = 3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda, Kazuma Uto, Shinichiro Seki, Yoshinori Onose, Yoshinori Tokura, Ryoichi Kajimoto, Masaaki Matsuda

Research output: Contribution to journalArticlepeer-review

24 Citations (Scopus)

Abstract

We investigated an effect of spin dilution on the magnetic and thermal properties of delafossite CuCrO2 having an S = 3=2 antiferromagnetic triangular lattice (ATL) by the substitution of Al3+ for Cr 3+ by measurements of magnetization, specific heat, and neutron scattering. Spin defects introduced into Cr ATL layers blur the antiferromagnetic transition and induce a dimensional crossover of low-energy magnetic excitation in the residual Cr ATL region due to the reduction of inter-layer magnetic interaction, while accompanying an enhancement of a spin-glass component. The observed T2 contribution to the low-T Cmag above y = 0:15, as well as in Cu0:85Ag 0:15CrO2, comes mainly from a short-range 2D AF excitation originating in a nontrivial magnetic state such as spin-nematic or spinliquid states.

Original languageEnglish
Article number014711
JournalJournal of the Physical Society of Japan
Volume80
Issue number1
DOIs
Publication statusPublished - 2011 Jan 1
Externally publishedYes

Keywords

  • Antiferromagnetic triangular lattice
  • Delafossite oxide

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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