Zentaro HONDA, Koichi KATSUMATA (RIKEN), Tachi OHISHI, Toshio MANABE (Nagoya Univ.) and Masahiro YAMASHITA (Nagoya Univ. and IMS)
[J. Phys. Condens. Matter 9, L83 (1997)]
From a heat capacity measurement in high magnetic fields and low temperatures, we have obtained evidence for a magnetic ordering in the S =1 quasi-one dimensional Heisenberg antiferromagnet Ni(C5H14N2)2N3(ClO4). The transition temperature is ~0.6 K at 12 T parallel to the chain axis.