title: Microscopic coexistence of superconductivity and magnetism in Ba(1-x)K(x)Fe2As2.
abstract: It is widely believed that, in contrast to its electron-doped counterparts, the hole-doped compound Ba(1-x)K(x)Fe(2)As(2) exhibits a mesoscopic phase separation of magnetism and superconductivity in the underdoped region of the phase diagram. Here, we report a combined high-resolution x-ray powder diffraction and volume-sensitive muon spin rotation study of Ba(1-x)K(x)Fe(2)As(2) showing that this paradigm does not hold true in the underdoped region of the phase diagram (0≤x≤0.25). Instead we find a microscopic coexistence of the two forms of order. A competition of magnetism and superconductivity is evident from a significant reduction of the magnetic moment and a concomitant decrease of the magnetoelastically coupled orthorhombic lattice distortion below the superconducting phase transition.
authors.affiliation: Department Chemie, Ludwig-Maximilians-Universität München, D-81377 München, Germany.
authors.forename: Erwin
authors.initials: E
authors.lastname: Wiesenmayer
authors.forename: Hubertus
authors.initials: H
authors.lastname: Luetkens
authors.forename: Gwendolyne
authors.initials: G
authors.lastname: Pascua
authors.forename: Rustem
authors.initials: R
authors.lastname: Khasanov
authors.forename: Alex
authors.initials: A
authors.lastname: Amato
authors.forename: Heidi
authors.initials: H
authors.lastname: Potts
authors.forename: Benjamin
authors.initials: B
authors.lastname: Banusch
authors.forename: Hans-Henning
authors.initials: HH
authors.lastname: Klauss
authors.forename: Dirk
authors.initials: D
authors.lastname: Johrendt