Thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator $β'$-(BEDT-TTF)$_2$ICl$_2$
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| Format: | Preprint |
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2024
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| _version_ | 1866916241966366720 |
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| author | Eguchi, Kyohei Ito, Takeru Sato, Yoshiki J. Okazaki, Ryuji Taniguchi, Hiromi |
| author_facet | Eguchi, Kyohei Ito, Takeru Sato, Yoshiki J. Okazaki, Ryuji Taniguchi, Hiromi |
| contents | Low-dimensional materials, in which the electronic and transport properties are drastically modified in comparison to those of three-dimensional bulk materials, yield a key class of thermoelectric materials with high conversion efficiency. Among such materials, the organic compounds may serve peculiar properties owing to their unique molecular-based low-dimensional structures with highly anisotropic molecular orbitals. Here we present the thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator $β'$-(BEDT-TTF)$_2$ICl$_2$, where BEDT-TTF stands for bis(ethylenedithio)-tetrathiafulvalene. We find that the thermopower exhibits typical activation-type temperature variation expected for insulators but its absolute value is anomalously large compared to the expected value from the activation-type temperature dependence of the electrical resistivity. Successively, the Jonker-plot analysis, in which the thermopower is usually scaled by the logarithm of the resistivity, shows an unusual relation among such transport quantities. We discuss a role of the low dimensionality for the enhanced thermopower along with recent observations of such a large thermopower in several low-dimensional materials. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2404_19137 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator $β'$-(BEDT-TTF)$_2$ICl$_2$ Eguchi, Kyohei Ito, Takeru Sato, Yoshiki J. Okazaki, Ryuji Taniguchi, Hiromi Strongly Correlated Electrons Materials Science Soft Condensed Matter Chemical Physics Low-dimensional materials, in which the electronic and transport properties are drastically modified in comparison to those of three-dimensional bulk materials, yield a key class of thermoelectric materials with high conversion efficiency. Among such materials, the organic compounds may serve peculiar properties owing to their unique molecular-based low-dimensional structures with highly anisotropic molecular orbitals. Here we present the thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator $β'$-(BEDT-TTF)$_2$ICl$_2$, where BEDT-TTF stands for bis(ethylenedithio)-tetrathiafulvalene. We find that the thermopower exhibits typical activation-type temperature variation expected for insulators but its absolute value is anomalously large compared to the expected value from the activation-type temperature dependence of the electrical resistivity. Successively, the Jonker-plot analysis, in which the thermopower is usually scaled by the logarithm of the resistivity, shows an unusual relation among such transport quantities. We discuss a role of the low dimensionality for the enhanced thermopower along with recent observations of such a large thermopower in several low-dimensional materials. |
| title | Thermoelectric transport properties of the quasi-one-dimensional dimer-Mott insulator $β'$-(BEDT-TTF)$_2$ICl$_2$ |
| topic | Strongly Correlated Electrons Materials Science Soft Condensed Matter Chemical Physics |
| url | https://arxiv.org/abs/2404.19137 |