Role of hydrogen bonding in charge-ordered organic conductor $α$-(BEDT-TTF)$_2$I$_3$ probed by $^{127}$I nuclear quadrupole resonance
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arXiv
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| Autores principales: | , , , , , |
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| Formato: | Preprint |
| Publicado: |
2022
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| _version_ | 1866911176809512960 |
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| author | Kobayashi, T. Kato, Y. Taniguchi, H. Tsumuraya, T. Hiraki, K. Fujiyama, S. |
| author_facet | Kobayashi, T. Kato, Y. Taniguchi, H. Tsumuraya, T. Hiraki, K. Fujiyama, S. |
| contents | We present $^{127}$I nuclear quadrupole resonance spectra and nuclear relaxation of $α$-(BEDT-TTF)$_2$I$_3$ that undergoes a charge-ordering transition. Only one of the two I$_3$ anion sites shows a significant differentiation in the electric field gradients across the first-order transition. The charge modulation only in the BEDT-TTF layers can not reproduce; instead, an anion-donor interaction accompanied by hydrogen bonding is necessary. The dominating source for the nuclear relaxation is the local libration of the I$_3$ anions, but an anomalous peak is detected just below the transition, as observed by $^{13}$C NMR. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2208_05602 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Role of hydrogen bonding in charge-ordered organic conductor $α$-(BEDT-TTF)$_2$I$_3$ probed by $^{127}$I nuclear quadrupole resonance Kobayashi, T. Kato, Y. Taniguchi, H. Tsumuraya, T. Hiraki, K. Fujiyama, S. Strongly Correlated Electrons We present $^{127}$I nuclear quadrupole resonance spectra and nuclear relaxation of $α$-(BEDT-TTF)$_2$I$_3$ that undergoes a charge-ordering transition. Only one of the two I$_3$ anion sites shows a significant differentiation in the electric field gradients across the first-order transition. The charge modulation only in the BEDT-TTF layers can not reproduce; instead, an anion-donor interaction accompanied by hydrogen bonding is necessary. The dominating source for the nuclear relaxation is the local libration of the I$_3$ anions, but an anomalous peak is detected just below the transition, as observed by $^{13}$C NMR. |
| title | Role of hydrogen bonding in charge-ordered organic conductor $α$-(BEDT-TTF)$_2$I$_3$ probed by $^{127}$I nuclear quadrupole resonance |
| topic | Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2208.05602 |