In:
Scientific Reports, Springer Science and Business Media LLC, Vol. 6, No. 1 ( 2016-06-22)
Kurzfassung:
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 "Equation missing" , 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(Fe 1− x Co x ) 2 As 2 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 BaFe 2 As 2 system.
Materialart:
Online-Ressource
ISSN:
2045-2322
Sprache:
Englisch
Verlag:
Springer Science and Business Media LLC
Publikationsdatum:
2016
ZDB Id:
2615211-3
Bookmarklink