Dimensional crossover of low-energy magnetic excitation for delafossite oxide Cu1-xAgxCrO2 with a spin-3/2 antiferromagnetic triangular sublattice

Tetsuji Okuda, Taizo Kishimoto, Kazuma Uto, Takahisa Hokazono, Yoshinori Onose, Yoshinori Tokura, Ryoichi Kajimoto, Masaaki Matsuda

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25 Citations (Scopus)

Abstract

Dimensional crossover from anisotropic-three-dimensional (3D) to 2D low-energy magnetic excitations was found in delafossite oxide Cu 1-xAgxCrO2 having a spin-3/2 antiferromagnetic (AF) triangular lattice. The crossover is evidenced by a decrease in AF transition temperature (TN), distinct 2D magnetic excitations above TN for Cu0.85Ag0.15CrO2, a disappearance of a peak of magnetic specific heat (Cmag) around TN, and a successive change from T3 to T2 dependence of low-T Cmag accompanying a low-T shift of magnetic entropy. These results may suggest a gradual change from AF to spin-liquid like states with an increase in x.

Original languageEnglish
Article number013604
Journaljournal of the physical society of japan
Volume78
Issue number1
DOIs
Publication statusPublished - 2009 Jan
Externally publishedYes

Keywords

  • Antiferromagnetic triangular lattice
  • Delafossite
  • Magnetic frustration

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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