19F-NMR Study of Spin-1/2 Antiferromagnetic Chain D-F5PNN with a Single Crystal Crossing Critical Field Region

JPS Conf. Proc. 38, 011147 (2023) [7 pages]

Proceedings of the 29th International Conference on Low Temperature Physics (LT29)

¹⁹F-NMR Study of Spin-1/2 Antiferromagnetic Chain D-F₅PNN with a Single Crystal Crossing Critical Field Region

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Yutaka Fujii¹^,*, Yusuke Takahashi¹, Kaoru Maruyama¹, Kohei Nakagawa¹, Yuya Ishikawa¹, Konami Izumi², Naoko Sakai³, and Kunio Taguma³

¹Research Center for Development of Far-Infrared Region, University of Fukui, Fukui 910-8507, Japan

²National Institute of Advanced Industrial Science and Technology (AIST), Kashiwa, Chiba 277-0882, Japan

³Graduate School of Human and Environmental Studies, Kyoto University, Kyoto 606-8501, Japan

Received July 31, 2022

¹⁹F-NMR measurements of a single crystal of organic radical deuterated pentafluorophenyl-nitronyl-nitroxide (D-F₅PNN), which is characterized by a Heisenberg spin-1/2 antiferromagnetic chain model, were performed in a magnetic field of up to 8 T and at temperatures as low as 1.5 K. We obtained the hyperfine tensors of three ¹⁹F sites from the NMR spectra as a function of the magnetic field direction. The magnetic moment of the electron spin, calculated by splitting the spectra with hyperfine tensors, is consistent with data from macroscopic magnetization measurements. Furthermore, the spin fluctuations parallel to the magnetic field had a smaller contribution to the magnetic field dependence of the spin–lattice relaxation rate T₁⁻¹ of the para-¹⁹F site than for other sites.

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https://doi.org/10.7566/JPSCP.38.011147

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