title: Anomalous suppression of the orthorhombic lattice distortion in superconducting Ba(Fe1-xCox)2As2 single crystals.
abstract: High-resolution x-ray diffraction measurements reveal an unusually strong response of the lattice to superconductivity in Ba(Fe1-xCox)2As2. The orthorhombic distortion of the lattice is suppressed and, for Co doping near x=0.063, the orthorhombic structure evolves smoothly back to a tetragonal structure. We propose that the coupling between orthorhombicity and superconductivity is indirect and arises due to the magnetoelastic coupling, in the form of emergent nematic order, and the strong competition between magnetism and superconductivity.
authors.affiliation: Ames Laboratory, U.S. DOE and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA.
authors.forename: S
authors.initials: S
authors.lastname: Nandi
authors.forename: M G
authors.initials: MG
authors.lastname: Kim
authors.forename: A
authors.initials: A
authors.lastname: Kreyssig
authors.forename: R M
authors.initials: RM
authors.lastname: Fernandes
authors.forename: D K
authors.initials: DK
authors.lastname: Pratt
authors.forename: A
authors.initials: A
authors.lastname: Thaler
authors.forename: N
authors.initials: N
authors.lastname: Ni
authors.forename: S L
authors.initials: SL
authors.lastname: Bud'ko
authors.forename: P C
authors.initials: PC
authors.lastname: Canfield
authors.forename: J
authors.initials: J
authors.lastname: Schmalian
authors.forename: R J
authors.initials: RJ
authors.lastname: McQueeney
authors.forename: A I
authors.initials: AI
authors.lastname: Goldman