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- Title
Giant Thermopower at Low Temperatures in Novel Clathrates Ba{Cu,Zn}Ge.
- Authors
Bednar, I.; Royanian, E.; Bühler-Paschen, S.; Bauer, E.; Nasir, N.; Grytsiv, A.; Melnychenko-Koblyuk, N.; Rogl, P.
- Abstract
In the present work we focus on cubic type I Ba-Ge-based clathrates, where Ge in $$\rm Ba_8Ge_{43} \square_3$$ (where □ is a vacancy) is substituted by Cu, Zn, Pd, and Si. Structural investigations in all cases confirm cubic primitive symmetry consistent with the space group type $$Pm\bar{3}n$$ of a typical type I clathrate structure with lattice parameter a ≈ 1.06 nm. Electronic transport has been studied in a broad temperature range from 4.2 K to about 800 K, demonstrating that substitution allows fine-tuning of the charge carrier density, shifting the materials into the proximity of a metal-to-insulator transition. This is evidenced from giant thermopower reaching values of 400 μV/K in the case of BaCuZnGe at temperatures well below room temperature ( T ≈ 150 K).
- Subjects
CLATHRATE compounds; PHONONS; THERMOELECTRICITY; SEMICONDUCTORS; METAL quenching
- Publication
Journal of Electronic Materials, 2010, Vol 39, Issue 9, p1687
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-010-1231-3