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Submillimeter Wave ESR and High‐Field Magnetization Measurements of Aligned Powder Sample of Nd 2 BaNiO 5
Author(s) -
Okubo S.,
Ohta H.,
Hayashi M.,
Yamada T.,
Nojiri H.,
Sakon T.,
Motokawa M.,
Mogi I.,
Watanabe K.,
Kikuchi H.,
Nagasawa H.,
Kitamura N.
Publication year - 1999
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/(sici)1521-3951(199910)215:2<1099::aid-pssb1099>3.0.co;2-2
Subject(s) - antiferromagnetism , magnetization , condensed matter physics , anisotropy , materials science , submillimeter wave , field (mathematics) , magnetic field , terahertz radiation , physics , optics , optoelectronics , millimeter , mathematics , quantum mechanics , pure mathematics
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.