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Hall-plot of the phase diagram for Ba(Fe₁₋ₓCoₓ)₂As₂

Iida, K.; Grinenko, V.; Kurth, F.; Ichinose, A.; Tsukada, I.; Ahrens, E.; Pukenas, A.; Chekhonin, P.; Skrotzki, W.; Teresiak, A.; Hühne, R.; Aswartham, S.; Wurmehl, S.; Mönch, I.; Erbe, M.; Hänisch, J.; Holzapfel, B.; Drechsler, S.L.; Efremov, D.V.

Abstract (englisch):
The Hall effect is a powerful tool for investigating carrier type and density. For single-band materials, the Hall coefficient is traditionally expressed simply by , where e is the charge of the carrier, and n is the concentration. However, it is well known that in the critical region near a quantum phase transition, as it was demonstrated for cuprates and heavy fermions, the Hall coefficient exhibits strong temperature and doping dependencies, which can not be described by such a simple expression, and the interpretation of the Hall coefficient for Fe-based superconductors is also problematic. Here, we investigate thin films of Ba(Fe1−xCox)2As2 with compressive and tensile in-plane strain in a wide range of Co doping. Such in-plane strain changes the band structure of the compounds, resulting in various shifts of the whole phase diagram as a function of Co doping. We show that the resultant phase diagrams for different strain states can be mapped onto a single phase diagram with the Hall number. This universal plot is attributed to the critical fluctuations in multiband systems near the antiferromagnetic transition, which may sugge ... mehr


Zugehörige Institution(en) am KIT Institut für Technische Physik (ITEP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1038/srep28390
ISSN: 2045-2322
URN: urn:nbn:de:swb:90-560864
KITopen ID: 1000056086
HGF-Programm 37.06.02; LK 01
Erschienen in Scientific Reports
Band 6
Seiten Article number 28390
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