$^{23}$Na-NMR study on the one-dimensional superoxide spin-chain compound NaO$_2$
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arXiv
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| Autores principales: | , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908597389099008 |
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| author | Goto, Takayuki Miyajima, Mizuki Kambe, Takashi |
| author_facet | Goto, Takayuki Miyajima, Mizuki Kambe, Takashi |
| contents | We report $^{23}$Na-NMR study on a candidate one-dimensional quantum spin system NaO$_2$. The Knight shift, linewidth, and spin-lattice relaxation rate $1/T_1$ were investigated down to 0.3 K under fields up to 16 T. The results reveal the opening of a spin gap of $Δ(10.1 {\rm T}) \simeq$ 38 K below $T_{\rm S3} =$ 40 K, consistent with a spin-Peierls-like instability. The hyperfine coupling constant was found to drop sharply across the structural phase transition at $T_{\rm S2} =$ 215 K, highlighting the pronounced one-dimensional character of the system. These findings establish NaO$_2$ as a rare example of a $π$-orbital-based one-dimensional spin chain that exhibits a spin-gapped ground state. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_14505 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $^{23}$Na-NMR study on the one-dimensional superoxide spin-chain compound NaO$_2$ Goto, Takayuki Miyajima, Mizuki Kambe, Takashi Strongly Correlated Electrons Statistical Mechanics We report $^{23}$Na-NMR study on a candidate one-dimensional quantum spin system NaO$_2$. The Knight shift, linewidth, and spin-lattice relaxation rate $1/T_1$ were investigated down to 0.3 K under fields up to 16 T. The results reveal the opening of a spin gap of $Δ(10.1 {\rm T}) \simeq$ 38 K below $T_{\rm S3} =$ 40 K, consistent with a spin-Peierls-like instability. The hyperfine coupling constant was found to drop sharply across the structural phase transition at $T_{\rm S2} =$ 215 K, highlighting the pronounced one-dimensional character of the system. These findings establish NaO$_2$ as a rare example of a $π$-orbital-based one-dimensional spin chain that exhibits a spin-gapped ground state. |
| title | $^{23}$Na-NMR study on the one-dimensional superoxide spin-chain compound NaO$_2$ |
| topic | Strongly Correlated Electrons Statistical Mechanics |
| url | https://arxiv.org/abs/2510.14505 |