Yordanov, P. ; Gibbs, A. S. ; Kaya, P. ; Bette, S. ; Xie, W. ; Xiao, X. ; Weidenkaff, A. ; Takagi, H. ; Keimer, B. (2021)
High-temperature electrical and thermal transport properties of polycrystalline PdCoO2.
In: Physical Review Materials, 5 (1)
doi: 10.1103/PhysRevMaterials.5.015404
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The layered delafossite PdCoO2 has been predicted to be one of very few materials with a thermopower that is highly anisotropic and switches sign between different crystallographic directions. These properties are of interest for various applications, but have been difficult to verify because sufficiently large crystals have not been available. We report measurements of the high-temperature electrical resistivity, thermal conductivity, and thermopower of phase-pure PdCoO2 powder compacts prepared by a highly Pd-efficient synthesis route. While the electronic transport of the polycrystalline samples is dominated by that of the Pd planes, the thermopower exhibits a well-defined deviation from the in-plane character at temperatures above 600K, which is indicative of opposing trends in the Seebeck coefficients within and perpendicular to the delafossite layers. The experimental data are consistently described by a combination of effective-medium models based on the main axes transport quantities. The results support the predicted ambipolar thermopower anisotropy in PdCoO2.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2021 |
| Autor(en): | Yordanov, P. ; Gibbs, A. S. ; Kaya, P. ; Bette, S. ; Xie, W. ; Xiao, X. ; Weidenkaff, A. ; Takagi, H. ; Keimer, B. |
| Art des Eintrags: | Bibliographie |
| Titel: | High-temperature electrical and thermal transport properties of polycrystalline PdCoO2 |
| Sprache: | Englisch |
| Publikationsjahr: | 28 Januar 2021 |
| Verlag: | American Physical Society |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Physical Review Materials |
| Jahrgang/Volume einer Zeitschrift: | 5 |
| (Heft-)Nummer: | 1 |
| DOI: | 10.1103/PhysRevMaterials.5.015404 |
| URL / URN: | https://journals.aps.org/prmaterials/abstract/10.1103/PhysRe... |
| Kurzbeschreibung (Abstract): | The layered delafossite PdCoO2 has been predicted to be one of very few materials with a thermopower that is highly anisotropic and switches sign between different crystallographic directions. These properties are of interest for various applications, but have been difficult to verify because sufficiently large crystals have not been available. We report measurements of the high-temperature electrical resistivity, thermal conductivity, and thermopower of phase-pure PdCoO2 powder compacts prepared by a highly Pd-efficient synthesis route. While the electronic transport of the polycrystalline samples is dominated by that of the Pd planes, the thermopower exhibits a well-defined deviation from the in-plane character at temperatures above 600K, which is indicative of opposing trends in the Seebeck coefficients within and perpendicular to the delafossite layers. The experimental data are consistently described by a combination of effective-medium models based on the main axes transport quantities. The results support the predicted ambipolar thermopower anisotropy in PdCoO2. |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Werkstofftechnik und Ressourcenmanagement |
| Hinterlegungsdatum: | 12 Feb 2021 07:01 |
| Letzte Änderung: | 12 Feb 2021 07:01 |
| PPN: | |
| Projekte: | We acknowledge financial support by Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) – Project No. 107745057 - CRC/TRR 80, subproject G8, and partial support by Coherent Inc., Wilsonville, OR (USA). |
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