[{"type":"article-journal","title":"Hall-plot of the phase diagram for Ba(Fe\u2081\u208b\u2093Co\u2093)\u2082As\u2082","issued":{"date-parts":[["2016"]]},"volume":"6","page":"Art. Nr. 28390","container-title":"Scientific reports","DOI":"10.1038\/srep28390","author":[{"family":"Iida","given":"K."},{"family":"Grinenko","given":"V."},{"family":"Kurth","given":"F."},{"family":"Ichinose","given":"A."},{"family":"Tsukada","given":"I."},{"family":"Ahrens","given":"E."},{"family":"Pukenas","given":"A."},{"family":"Chekhonin","given":"P."},{"family":"Skrotzki","given":"W."},{"family":"Teresiak","given":"A."},{"family":"H\u00fchne","given":"R."},{"family":"Aswartham","given":"S."},{"family":"Wurmehl","given":"S."},{"family":"M\u00f6nch","given":"I."},{"family":"Erbe","given":"M."},{"family":"H\u00e4nisch","given":"J."},{"family":"Holzapfel","given":"B."},{"family":"Drechsler","given":"S. L."},{"family":"Efremov","given":"D. V."}],"ISSN":"2045-2322","abstract":"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(Fe\u2081\u208b\u2093Co\u2093)\u2082As\u2082 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\u2082As\u2082 system.","kit-publication-id":"1000056086"}]