Realization of a triangular spin necklace in a verdazyl-based Ni complex
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arXiv
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| Autori principali: | , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866909998818263040 |
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| author | Shimamura, Itsuki Yagura, Risa Kida, Takanori Hagiwara, Masayuki Araki, Koji Iwasaki, Yoshiki Hosokoshi, Yuko Kimura, Kenta Yamaguchi, Hironori |
| author_facet | Shimamura, Itsuki Yagura, Risa Kida, Takanori Hagiwara, Masayuki Araki, Koji Iwasaki, Yoshiki Hosokoshi, Yuko Kimura, Kenta Yamaguchi, Hironori |
| contents | We successfully synthesized a verdazyl-based complex, ($m$-Py-V)$_3$[Ni(NO$_3$)$_2$], in which Ni$^{2+}$ ions and verdazyl radicals form a one-dimensional, triangular spin necklace consisting of spin-1/2 and spin-1 units. Molecular orbital calculations reveal strong antiferromagnetic (AF) interactions between inversion-related radical pairs that form spin-1/2 singlet dimers. The remaining verdazyl and Ni$^{2+}$ spins form frustrated triangular units, creating a distinctive spin network. Magnetic susceptibility and specific heat measurements identify a phase transition to an AF order. The application of magnetic fields suppresses the phase transition signal, suggesting field-induced decoupling of the spin-1 moments. Electron spin resonance measurements are used to evaluate the easy-axis anisotropy of spin-1, which may promote the AF order. This work provides a rare example of a geometrically frustrated quantum spin chain realized via molecular design, thereby offering a platform for exploring frustration-driven quantum phases in low-dimensional materials. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16389 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Realization of a triangular spin necklace in a verdazyl-based Ni complex Shimamura, Itsuki Yagura, Risa Kida, Takanori Hagiwara, Masayuki Araki, Koji Iwasaki, Yoshiki Hosokoshi, Yuko Kimura, Kenta Yamaguchi, Hironori Strongly Correlated Electrons Materials Science We successfully synthesized a verdazyl-based complex, ($m$-Py-V)$_3$[Ni(NO$_3$)$_2$], in which Ni$^{2+}$ ions and verdazyl radicals form a one-dimensional, triangular spin necklace consisting of spin-1/2 and spin-1 units. Molecular orbital calculations reveal strong antiferromagnetic (AF) interactions between inversion-related radical pairs that form spin-1/2 singlet dimers. The remaining verdazyl and Ni$^{2+}$ spins form frustrated triangular units, creating a distinctive spin network. Magnetic susceptibility and specific heat measurements identify a phase transition to an AF order. The application of magnetic fields suppresses the phase transition signal, suggesting field-induced decoupling of the spin-1 moments. Electron spin resonance measurements are used to evaluate the easy-axis anisotropy of spin-1, which may promote the AF order. This work provides a rare example of a geometrically frustrated quantum spin chain realized via molecular design, thereby offering a platform for exploring frustration-driven quantum phases in low-dimensional materials. |
| title | Realization of a triangular spin necklace in a verdazyl-based Ni complex |
| topic | Strongly Correlated Electrons Materials Science |
| url | https://arxiv.org/abs/2601.16389 |