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ID 18814
本文ファイル
著者
Hosokoshi, Yuko
Nakazawa, Yasuhiro
Takizawa, Kohichi
Nakano, Hiroki
Takahashi, Minoru
Goto, Tsuneaki
抄録(英)
Stable organic biradical crystals PNNNO, F2PNNNO, and PIMNO of the PNNNO family were synthesized. {PNNNO=2-[4′- (N-tert-butyl-N-oxyamino)phenyl]-4,4,5,5-tetramethyl-4,5-dihydro-1H-imidazol-1- oxyl 3-oxide, F2PNNNO= 2-[2′,6′,-difluoro-4′-(N-tert-butyl-7V-oxyamino)phenyl]-4,4,5, 5-tetramethyl-4, 5-dihydro-1H-imidazol-1-oxyl 3-oxide, PIMNO=2-[4′-(N-tert-butyl-N-oxyamino)-phenyl]-4,4,5, 5-tetramethyl-4,5-dihydro-1H-imidazol-1-oxyl.} PNNNO and PIMNO crystallize to form quasi-one-dimensional lattices, but F2PNNNO to form a quasi-two-dimensional lattice. The temperature dependences of the susceptibility and the high-field magnetization process up to 34 T were measured down to 0.5 K. The results are analyzed by comparing with the theoretical calculations based on the crystal structures. PNNNO and PIMNO are considered to be antiferromagnetic Heisenberg spin chains consisting of S=1/2 spin pairs (dimers) in which the two spins are coupled ferromagnetically. At low temperatures, an antiferromagnetic ordering occurs in these crystals, which is confirmed by the thermodynamic discussion through specific heat measurements. On the other hand, F2PNNNO is thought to be a two-dimensional Heisenberg system, in which the spin pairs are connected by two types of antiferromagnetic interactions. The ground state is singlet. The high-field magnetization process shows a two-step saturation with a plateau of the half value of the saturation magnetization.
掲載誌名
Physical Review B - Condensed Matter and Materials Physics
60巻
18号
開始ページ
12 924
終了ページ
12 932
出版年月日
1999-11-01
出版者
American Physical Society
ISSN
1098-0121
NCID
出版者DOI
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
Copyright (c) 1999 The American Physical Society.
関連情報URL
部局名
理学研究科