Spin-1=2 quantum antiferromagnet on a three-dimensional honeycomb lattice formed by a new organic biradical F4BIPBNN

Naoki Amaya, Toshio Ono, Yuta Oku, Hironori Yamaguchi, Akira Matsuo, Koichi Kindo, Hiroyuki Nojiri, Fernando Palacio, Javier Campo, Yuko Hosokoshi

研究成果: Article査読

3 被引用数 (Scopus)

抄録

We have succeeded in synthesizing a new organic biradical F4BIPBNN [= 2,2′-(3,3′,5,5′-tetrafluorobiphenyl-4,4′-diyl)bis(4,4,5,5-tetramethylimidazolin-1-oxyl 3-oxide)] which forms an S = 1=2 Heisenberg three-dimensional honeycomb antiferromagnet. Each site of a honeycomb layer alternately couples with upper or lower layers, which results in the unique three-dimensional honeycomb network with four nearest neighbors. At zero magnetic field, antiferromagnetic long-range order has been observed below TN = 2.7 K. Magnetic susceptibility in both paramagnetic and antiferromagnetic states and the magnetization curves are well reproduced by quantum Monte Carlo calculations with three antiferromagnetic interactions in the range of 4.3 to 6.6 K. From the concave shape of the magnetization curve, the shrinkage of spin due to spin fluctuations is evaluated to approximately 30% with respect to its classical value. The phase diagram of magnetic field versus temperature was determined by heat capacity and magnetization. In the field region below 3 T, a slight increase of TN was observed, which reflects the effect of spin fluctuations.

本文言語English
論文番号074706
ジャーナルjournal of the physical society of japan
86
7
DOI
出版ステータスPublished - 2017 7月 15

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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