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High-field Multi-frequency ESR in the S=2 Heisenberg Antiferromagnetic Chain Compound MnCl3(bpy)
Masayuki Hagiwara,Masami Ikeda,Yuichi Idutsu,Shojiro Kimura,Zentaro Honda 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.62 No.12
We report the results of high-field multi-frequency electron spin resonance (ESR) experimentson a powder sample of MnCl3 (bpy) (bpy=2, 2’-bipyridine). This compound is one of the rareexamples of the spin (S) 2 quasi one-dimensional (1D) Heisenberg antiferromagnets (HAFs), andmagnetic properties of tiny single crystal samples were reported previously (G. E. Granroth et al.,Phys. Rev. Lett. 77, 1616 (1996).). In our previous paper on this compound (M. Hagiwara et al.,J. Phys.: Conf. Ser. 400, 032014 (2012).), we reported, for the S=2 1D HAF, good agreementbetween experiment and calculation for the temperature dependence of magnetic susceptibility andthe high-field magnetization process at 1.3 K. In this work, we have observed some high-frequencyresonance modes with zero-field gaps of about 800 GHz that may correspond to antiferromagneticresonance modes with orthorhombic anisotropy in a long-range-ordered phase that emerged at lowtemperatures above the critical field at which the energy gap (Haldane gap) closes. The single-ionanisotropy constant D evaluated from the analysis of these ESR modes is larger than that reportedpreviously.