Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates
We investigate the Seebeck and Nernst effects of pyrochlore iridium oxides (Nd1−xPrx)2Ir2O7 across the thermally induced and magnetic field-induced metal–insulator and topological transitions. Nd2Ir2O7 exhibits the salient temperature dependence of the Seebeck coefficient accompanied by the enhancem...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
AIP Publishing LLC
2022-09-01
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| Series: | APL Materials |
| Online Access: | http://dx.doi.org/10.1063/5.0097460 |
| _version_ | 1811232029631578112 |
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| author | Kentaro Ueda Jun Fujioka Naoya Kanazawa Yoshinori Tokura |
| author_facet | Kentaro Ueda Jun Fujioka Naoya Kanazawa Yoshinori Tokura |
| author_sort | Kentaro Ueda |
| collection | DOAJ |
| description | We investigate the Seebeck and Nernst effects of pyrochlore iridium oxides (Nd1−xPrx)2Ir2O7 across the thermally induced and magnetic field-induced metal–insulator and topological transitions. Nd2Ir2O7 exhibits the salient temperature dependence of the Seebeck coefficient accompanied by the enhancement of the Nernst effect in the vicinity of the thermal magnetic transitions. Moreover, the Seebeck coefficient shows a remarkable magnetic field hysteresis with the differential magnitude reaching as large as 110 μV/K, as the conductive magnetic domain walls are generated/annihilated by the external field. For x = 0.5, the Nernst signal increases rapidly across the field-induced metal–insulator transitions, exceeding the values reported in existing ferromagnetic oxides. These findings indicate that the thermoelectric effects increase significantly near the topological electronic phase transitions in strongly correlated systems, providing a new guideline for thermoelectric material design. |
| first_indexed | 2024-04-12T10:56:19Z |
| format | Article |
| id | doaj.art-1bcf582dedca4a0282bf756b09a67d07 |
| institution | Directory Open Access Journal |
| issn | 2166-532X |
| language | English |
| last_indexed | 2024-04-12T10:56:19Z |
| publishDate | 2022-09-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Materials |
| spelling | doaj.art-1bcf582dedca4a0282bf756b09a67d072022-12-22T03:36:05ZengAIP Publishing LLCAPL Materials2166-532X2022-09-01109091111091111-610.1063/5.0097460Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridatesKentaro Ueda0Jun Fujioka1Naoya Kanazawa2Yoshinori Tokura3Department of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, JapanInstitute of Materials Science, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8573, JapanDepartment of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, JapanDepartment of Applied Physics, University of Tokyo, Hongo, Tokyo 113-8656, JapanWe investigate the Seebeck and Nernst effects of pyrochlore iridium oxides (Nd1−xPrx)2Ir2O7 across the thermally induced and magnetic field-induced metal–insulator and topological transitions. Nd2Ir2O7 exhibits the salient temperature dependence of the Seebeck coefficient accompanied by the enhancement of the Nernst effect in the vicinity of the thermal magnetic transitions. Moreover, the Seebeck coefficient shows a remarkable magnetic field hysteresis with the differential magnitude reaching as large as 110 μV/K, as the conductive magnetic domain walls are generated/annihilated by the external field. For x = 0.5, the Nernst signal increases rapidly across the field-induced metal–insulator transitions, exceeding the values reported in existing ferromagnetic oxides. These findings indicate that the thermoelectric effects increase significantly near the topological electronic phase transitions in strongly correlated systems, providing a new guideline for thermoelectric material design.http://dx.doi.org/10.1063/5.0097460 |
| spellingShingle | Kentaro Ueda Jun Fujioka Naoya Kanazawa Yoshinori Tokura Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates APL Materials |
| title | Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates |
| title_full | Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates |
| title_fullStr | Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates |
| title_full_unstemmed | Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates |
| title_short | Large magneto-thermoelectric effect on the verge of metal–insulator and topological transitionsin pyrochlore iridates |
| title_sort | large magneto thermoelectric effect on the verge of metal insulator and topological transitionsin pyrochlore iridates |
| url | http://dx.doi.org/10.1063/5.0097460 |
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