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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 suggest a direct link between magnetic and superconducting properties in the BaFe2As2 system.

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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