Z2 Vortex-Induced Broadening of the EPR Linewidth in the Two-Dimensional Triangular Lattice Antiferromagnets, HCrO2 and LiCrO2

Yoshitami Ajiro, Hikomitsu Kikuchi, Shu Ichiro Sugiyama, Takeshi Nakashima, Shin Ichi Shamoto, Noriaki Nakayama, Masao Kiyama, Naoichi Yamamoto, Yoshio Oka

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Abstract

The title compounds are the family of the AMO2-type (R3m) crystal which has a pronounced layer structure and are promising candidates for the two-dimensional Heisenberg triangular lattice antiferromagnet (2DH TAL-AF). The interesting observation is that a singular point of the EPR signal is located around TKM=0.66JS2 for the critical temperature of phase transition associated with the pairing-dissociation of the Z2 vortices, suggesting the present system behaves as 2DH TAL-AF down to very close to TKM. The EPR linewidth exhibits Z2 vortex-induced broadening above the critical temperature which is inversely proportional to the thermally excited vortex density, nv∝exp (–Ev/kBT) with the activation energy Ev≅4kBTKM.

Original languageEnglish
Pages (from-to)2268-2271
Number of pages4
JournalJournal of the Physical Society of Japan
Volume57
Issue number7
DOIs
Publication statusPublished - 1988

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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