Abstract
Three-dimensional antiferromagnet Nd 2 BaNiO 5 is the related substance of the Haldane system Y 2 BaNiO 5 . Although Nd 2 BaNiO 5 has one-dimensional NiO 6 chains, these chains were connected by Nd-Ni antiferromagnetic interactions and Nd 2 BaNiO 5 undergoes antiferromagnetic order below T N = 48 K. In order to investigate the magnetic anisotropy of Nd 2 BaNiO 5 , aligned powder samples of Nd 2 BaNiO 5 were prepared and were studied by the submillimeter wave ESR and high-field magnetization measurements. Although two magnetic transitions at 9.6 and 16.2 T were known by previous magnetization measurements using powder samples, the measurements using our aligned powder samples revealed that these transitions are metamagnetic transitions. Antiferromagnetic modes, which have antiferromagnetic gaps of 240 GHz and 1 THz, have been also observed by the submillimeter ESR measurements at 1.8 K. The origin of these modes is discussed.
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