|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'501'711
Articles rated: 2609
20 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Seebeck effect in Fe1+xTe1-ySey single crystals | | I.Pallecchi
; G.Lamura
; M.Tropeano
; M.Putti
; R.Viennois
; E.Giannini
; D.Van der Marel
; | | Date: |
1 Oct 2009 | | Abstract: | We present measurements of resistivity and thermopower of Fe1+xTe1-ySey
single crystalline samples with y=0, 0.1, 0.2, 0.3 and 0.45 in zero field and
in a magnetic field B=8T. We propose a qualitative analysis of the temperature
behavior of S, where the samples are described as almost compensated
semimetals: different electron and hole bands with similar carrier
concentrations compete and their relative contribution to the thermoelectric
transport depends on the respective filling, mobility and coupling with
phonons. For y>=0.2, superconductivity occurs and the optimum Se-doping level
for a maximum Tc of 13 K turns out to be y=0.3. At low temperatures, evidence
of a contribution to S by an excitation-drag mechanism is found, while at high
temperatures a strikingly flat behavior of S is explained within a narrow band
Hubbard model. The support of a theoretical background which could provide band
resolved parameters such as carrier density, mobility and electron-phonon
coupling of each band would allow to extract from our data valuable
quantitative information on the transport and superconducting mechanisms of
these iron chalcogenides. | | Source: | arXiv, 0910.0191 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER