Haldane State Formed by Oxygen Molecules Encapsulated in Single-Walled Carbon Nanotubes

被引:12
作者
Hagiwara, Masayuki [1 ]
Ikeda, Masami [1 ]
Kida, Takanori [1 ]
Matsuda, Kazuyuki [2 ]
Tadera, Shin [3 ]
Kyakuno, Haruka [3 ]
Yanagi, Kazuhiro [3 ]
Maniwa, Yutaka [3 ]
Okunishi, Kouichi [4 ]
机构
[1] Osaka Univ, Grad Sch Sci, Ctr Adv High Magnet Field Sci, Toyonaka, Osaka 5600043, Japan
[2] Kanagawa Univ, Fac Engn, Yokohama, Kanagawa 2218686, Japan
[3] Tokyo Metropolitan Univ, Dept Phys, Fac Sci, Hachioji, Tokyo 1920397, Japan
[4] Niigata Univ, Dept Phys, Fac Sci, Niigata 9502181, Japan
关键词
CHAIN HEISENBERG-ANTIFERROMAGNET; MAGNETIC-PROPERTIES; WATER; METAL;
D O I
10.7566/JPSJ.83.113706
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We report on the results of X-ray diffraction (XRD), magnetic susceptibility, and high-field magnetization measurements of oxygen molecules, which are unique magnetic homonuclear diatomic molecules with spin-1, encapsulated in single-walled carbon nanotubes (SWCNTs) with diameters of about 0.8 nm. Antiferromagnetic interactions between neighboring oxygen molecules are expected in SWCNTs, resulting in the formation of a spin-1 one-dimensional Heisenberg antiferromagnet, known as a Haldane magnet. The XRD pattern can be predicted accurately by considering the expected oxygen molecule alignment. The temperature evolution of the magnetic susceptibility and the high-field magnetization curve are typical of those for a Haldane magnet with spin-1. The results indicate that the Haldane state has been realized in a nanospaced material for the first time. This provides an alternative to the conventional condensed matter approach to forming quantum spin systems.
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页数:4
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