title: Nematic susceptibility of hole-doped and electron-doped BaFe2As2 iron-based superconductors from shear modulus measurements.
abstract: The nematic susceptibility, χφ, of hole-doped Ba(1-x)K(x)Fe2As2 and electron-doped Ba(Fe(1-x)Co(x))2As2 iron-based superconductors is obtained from measurements of the elastic shear modulus using a three-point bending setup in a capacitance dilatometer. Nematic fluctuations, although weakened by doping, extend over the whole superconducting dome in both systems, suggesting their close tie to superconductivity. Evidence for quantum critical behavior of χφ is, surprisingly, only found for Ba(Fe(1-x)Co(x))2As2 and not for Ba(1-x)K(x)Fe2As2--the system with the higher maximal Tc value.
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany and Fakultät für Physik, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
authors.forename: A E
authors.initials: AE
authors.lastname: Böhmer
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany and Fakultät für Physik, Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Burger
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: F
authors.initials: F
authors.lastname: Hardy
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: T
authors.initials: T
authors.lastname: Wolf
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: P
authors.initials: P
authors.lastname: Schweiss
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: R
authors.initials: R
authors.lastname: Fromknecht
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria.
authors.forename: M
authors.initials: M
authors.lastname: Reinecker
authors.affiliation: Faculty of Physics, University of Vienna, Boltzmanngasse 5, Vienna A-1090, Austria.
authors.forename: W
authors.initials: W
authors.lastname: Schranz
authors.affiliation: Institut für Festkörperphysik, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany.
authors.forename: C
authors.initials: C
authors.lastname: Meingast