Muon-spin-relaxation study of the ground state of the two-dimensional <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>S</mi><mo>=</mo><mn>1</mn><mn></mn></math> kagoméantiferromagnet [2-(3-N-methyl-pyridium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-N-oxide]BF<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow></mrow><mrow><mn>4</mn></mrow></msub></mrow></math>

Isao Watanabe; Nobuo Wada; Hideo Yano; Tsuneyuki Okuno; Kunio Awaga; Seiko Ohira; Kusuo Nishiyama; Kanetada Nagamine

doi:10.1103/PhysRevB.58.2438

Muon-spin-relaxation study of the ground state of the two-dimensional $S = 1$ kagoméantiferromagnet [2-(3-N-methyl-pyridium)-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl 3-N-oxide]BF $_{4}$

Isao Watanabe, Nobuo Wada, Hideo Yano, Tsuneyuki Okuno, Kunio Awaga, Seiko Ohira, Kusuo Nishiyama, and Kanetada Nagamine

Phys. Rev. B 58, 2438 – Published 1 August 1998

Abstract

Zero- and longitudinal-field positive muon spin relaxation $(μ^{+} SR)$ measurements were carried out from 300 K to 30 mK to study a ground state of $m - {MPYNN \cdot BF}_{4}$ which is known to be a two-dimensional kagomé antiferromagnet with $S = 1$ by ac-susceptibility measurements. An implanted muon is expected to make a hydrogen bonding state with $F^{-}$ ions in the crystal. Muon-spin depolarization by a dynamically fluctuating component of an internal field was still observed at 30 mK. This fluctuating component is suggested to be caused by an intradimer ferromagnetic interaction of ${2 J}_{0} {/ k}_{B} = 23.3$ K between radicals. No clear long-range magnetic ordering of the dimer spins was observed down to 30 mK, suggesting that the ground state of $m - {MPYNN \cdot BF}_{4}$ was nonmagnetic.

Received 13 January 1998

DOI:https://doi.org/10.1103/PhysRevB.58.2438

Authors & Affiliations

Isao Watanabe

Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Hirosawa, Wako, Saitama 351-01, Japan

Nobuo Wada and Hideo Yano

Basic Science, Graduate School of Arts and Science, University of Tokyo, Komaba, Tokyo 153, Japan

Tsuneyuki Okuno

Department of Material Science and Chemistry, Faculty of System Engineering, Wakayama University, Wakayama 930, Japan

Kunio Awaga

Basic Science, Graduate School of Arts and Science, University of Tokyo, Komaba, Tokyo 153, Japan

Seiko Ohira

Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Hirosawa, Wako, Saitama 351-01, Japan
Meson Science Laboratory, Institute of Material Structure Science, High Energy Accelerator Research Organization (KEK-MSL), 1-1 Oho, Tsukuba, Ibaraki 305, Japan

Kusuo Nishiyama

Meson Science Laboratory, Institute of Material Structure Science, High Energy Accelerator Research Organization (KEK-MSL), 1-1 Oho, Tsukuba, Ibaraki 305, Japan

Kanetada Nagamine

Muon Science Laboratory, The Institute of Physical and Chemical Research (RIKEN), Hirosawa, Wako, Saitama 351-01, Japan
Meson Science Laboratory, Institute of Material Structure Science, High Energy Accelerator Research Organization (KEK-MSL), 1-1 Oho, Tsukuba, Ibaraki 305, Japan

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Vol. 58, Iss. 5 — 1 August 1998

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