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

doi:10.1143/JPSJ.57.2268

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

49 Citations (Scopus)

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 T_KM=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 T_KM. The EPR linewidth exhibits Z₂ vortex-induced broadening above the critical temperature which is inversely proportional to the thermally excited vortex density, n_v∝exp (–E_v/k_BT) with the activation energy E_v≅4k_BT_KM.

Original language	English
Pages (from-to)	2268-2271
Number of pages	4
Journal	Journal of the Physical Society of Japan
Volume	57
Issue number	7
DOIs	https://doi.org/10.1143/JPSJ.57.2268
Publication status	Published - 1988

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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

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.",

author = "Yoshitami Ajiro and Hikomitsu Kikuchi and Sugiyama, {Shu Ichiro} and Takeshi Nakashima and Shamoto, {Shin Ichi} and Noriaki Nakayama and Masao Kiyama and Naoichi Yamamoto and Yoshio Oka",

year = "1988",

doi = "10.1143/JPSJ.57.2268",

language = "English",

volume = "57",

pages = "2268--2271",

journal = "Journal of the Physical Society of Japan",

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publisher = "Physical Society of Japan",

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T1 - Z2 Vortex-Induced Broadening of the EPR Linewidth in the Two-Dimensional Triangular Lattice Antiferromagnets, HCrO2 and LiCrO2

AU - Ajiro, Yoshitami

AU - Kikuchi, Hikomitsu

AU - Sugiyama, Shu Ichiro

AU - Nakashima, Takeshi

AU - Shamoto, Shin Ichi

AU - Nakayama, Noriaki

AU - Kiyama, Masao

AU - Yamamoto, Naoichi

AU - Oka, Yoshio

PY - 1988

Y1 - 1988

N2 - 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.

AB - 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.

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

Abstract

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