Valence effect on the thermopower of Eu systems
| Autor: | Nubia Caroca-Canales, Silvia Seiro, Christoph Geibel, U. Stockert, Elena Hassinger |
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| Rok vydání: | 2020 |
| Předmět: |
Physics
Thermoelectric transport Valence (chemistry) Condensed matter physics Strongly Correlated Electrons (cond-mat.str-el) FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Effective nuclear charge ddc Condensed Matter - Strongly Correlated Electrons Condensed Matter::Materials Science Seebeck coefficient 0103 physical sciences Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Maxima |
| DOI: | 10.48550/arxiv.2003.05713 |
| Popis: | We investigated the thermoelectric transport properties of EuNi2P2 and EuIr2Si2 in order to evaluate the relevance of Kondo interaction and valence fluctuations in these materials. While the thermal conductivities behave conventionally, the thermopower curves exhibit large values with pronounced maxima as typically observed in Ce- and Yb-based heavy-fermion materials. However, neither the positions of these maxima nor the absolute thermopower values at low temperature are in line with the heavy-fermion scenario and the moderately enhanced effective charge carrier masses. Instead, we may relate the thermopower in our materials to the temperature-dependent Eu valence by taking into account changes in the chemical potential. Our analysis confirms that valence fluctuations play an important role in EuNi2P2 and EuIr2Si2. Comment: 7 pages, 3 figures |
| Databáze: | OpenAIRE |
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