TY - JOUR
T1 - High field ESR and magnetization in Na2Co2(C 2O4)3(H2O)2
AU - Nakagawa, Yoshiyuki
AU - Kashiwagi, Takanari
AU - Yamaguchi, Hironori
AU - Kimura, Shojiro
AU - Honda, Zentaro
AU - Yamada, Koji
AU - Kindo, Koichi
AU - Hagiwara, Masayuki
PY - 2006/12
Y1 - 2006/12
N2 - 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.
AB - 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.
KW - Antiferromagnetic dimer
KW - High field ESR
KW - High field magnetization
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U2 - 10.1143/JPSJ.75.124708
DO - 10.1143/JPSJ.75.124708
M3 - Article
AN - SCOPUS:33847306108
SN - 0031-9015
VL - 75
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 12
M1 - 124708
ER -