Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities
We investigate the layered magnetic semiconductor EuTe_{4}, focusing on its intricate charge-density-wave (CDW) states near and above room temperature through single-crystal x-ray diffraction (XRD), magnetic, and thermoelectric measurements. The XRD measurement revealed that the CDW state inducing t...
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| Format: | Article |
| Language: | English |
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American Physical Society
2025-08-01
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| Series: | PRX Energy |
| Online Access: | http://doi.org/10.1103/9bvh-3r6w |
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| author | Hidefumi Takahashi Kiichiro Yoshida Akitoshi Nakano Shintaro Ishiwata |
| author_facet | Hidefumi Takahashi Kiichiro Yoshida Akitoshi Nakano Shintaro Ishiwata |
| author_sort | Hidefumi Takahashi |
| collection | DOAJ |
| description | We investigate the layered magnetic semiconductor EuTe_{4}, focusing on its intricate charge-density-wave (CDW) states near and above room temperature through single-crystal x-ray diffraction (XRD), magnetic, and thermoelectric measurements. The XRD measurement revealed that the CDW state inducing the polar lattice distortion persists even at 650 K, demonstrating its remarkable thermal stability. Notably, the Seebeck coefficient near room temperature reaches values exceeding 500 µV K^{−1}. This large Seebeck coefficient, not fully captured by a simple band calculation, is comparable to those observed in heavy-electron semiconducting oxides, suggesting the importance of electron correlation and spin- and lattice instabilities. Furthermore, potentially reflecting the competition of two types of CDW state, the thermal conductivity near room temperature is as low as 0.02 W cm^{−1} K^{−1}. As a result, the thermoelectric figure of merit zT reaches 0.22 at 460 K. These findings establish EuTe_{4} as a compelling platform to explore novel types of thermoelectric materials with multiple electronic instability. |
| format | Article |
| id | doaj-art-65375b80a89946dca74b6229c70df739 |
| institution | Kabale University |
| issn | 2768-5608 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | PRX Energy |
| spelling | doaj-art-65375b80a89946dca74b6229c70df7392025-08-21T14:01:30ZengAmerican Physical SocietyPRX Energy2768-56082025-08-014303300910.1103/9bvh-3r6wEnhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave InstabilitiesHidefumi TakahashiKiichiro YoshidaAkitoshi NakanoShintaro IshiwataWe investigate the layered magnetic semiconductor EuTe_{4}, focusing on its intricate charge-density-wave (CDW) states near and above room temperature through single-crystal x-ray diffraction (XRD), magnetic, and thermoelectric measurements. The XRD measurement revealed that the CDW state inducing the polar lattice distortion persists even at 650 K, demonstrating its remarkable thermal stability. Notably, the Seebeck coefficient near room temperature reaches values exceeding 500 µV K^{−1}. This large Seebeck coefficient, not fully captured by a simple band calculation, is comparable to those observed in heavy-electron semiconducting oxides, suggesting the importance of electron correlation and spin- and lattice instabilities. Furthermore, potentially reflecting the competition of two types of CDW state, the thermal conductivity near room temperature is as low as 0.02 W cm^{−1} K^{−1}. As a result, the thermoelectric figure of merit zT reaches 0.22 at 460 K. These findings establish EuTe_{4} as a compelling platform to explore novel types of thermoelectric materials with multiple electronic instability.http://doi.org/10.1103/9bvh-3r6w |
| spellingShingle | Hidefumi Takahashi Kiichiro Yoshida Akitoshi Nakano Shintaro Ishiwata Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities PRX Energy |
| title | Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities |
| title_full | Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities |
| title_fullStr | Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities |
| title_full_unstemmed | Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities |
| title_short | Enhanced Thermopower in a Magnetic Semiconductor EuTe_{4} with Multiple Charge-Density-Wave Instabilities |
| title_sort | enhanced thermopower in a magnetic semiconductor eute 4 with multiple charge density wave instabilities |
| url | http://doi.org/10.1103/9bvh-3r6w |
| work_keys_str_mv | AT hidefumitakahashi enhancedthermopowerinamagneticsemiconductoreute4withmultiplechargedensitywaveinstabilities AT kiichiroyoshida enhancedthermopowerinamagneticsemiconductoreute4withmultiplechargedensitywaveinstabilities AT akitoshinakano enhancedthermopowerinamagneticsemiconductoreute4withmultiplechargedensitywaveinstabilities AT shintaroishiwata enhancedthermopowerinamagneticsemiconductoreute4withmultiplechargedensitywaveinstabilities |