High field ESR and magnetization in Na2Co2(C 2O4)3(H2O)2

Yoshiyuki Nakagawa, Takanari Kashiwagi, Hironori Yamaguchi, Shojiro Kimura, Zentaro Honda, Koji Yamada, Koichi Kindo, Masayuki Hagiwara

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10 Citations (Scopus)


We report the results of electron spin resonance (ESR) and magnetization measurements in high magnetic fields up to about 52 T on single crystal and powder samples of the cobalt compound Na2Co2(C 2O4)3(H2O) 2 which consists of two-leg ladders of Co2+ ions. This compound was reported to be a candidate which show a signature of a quantum phase transition from a spin-liquid to a Néel ordered state [Z. Honda et al.: Phys. Rev. Lett. 95 (2005) 087204]. From our ESR and magnetization experiments, we, however, have found that the compound is well described by almost isolated antiferromagnetic dimers which are formed by the nearest Co spins on the rungs and the interaction along the rung direction is much larger than that along the leg one. The ESR frequency-field diagram, magnetic susceptibility and magnetization are in good agreement with those calculated from this isolated dimer model.

Original languageEnglish
Article number124708
JournalJournal of the Physical Society of Japan
Issue number12
Publication statusPublished - 2006 Dec


  • Antiferromagnetic dimer
  • High field ESR
  • High field magnetization


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