title: Effects of nematic fluctuations on the elastic properties of iron arsenide superconductors.
abstract: We demonstrate that the changes in the elastic properties of the FeAs systems, as seen in our resonant ultrasound spectroscopy data, can be naturally understood in terms of fluctuations of emerging nematic degrees of freedom. Both the softening of the lattice in the normal, tetragonal phase as well as its hardening in the superconducting phase are consistently described by our model. Our results confirm the view that structural order is induced by magnetic fluctuations.
authors.affiliation: Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA. rafaelmf@ameslab.gov
authors.forename: R M
authors.initials: RM
authors.lastname: Fernandes
authors.forename: L H
authors.initials: LH
authors.lastname: VanBebber
authors.forename: S
authors.initials: S
authors.lastname: Bhattacharya
authors.forename: P
authors.initials: P
authors.lastname: Chandra
authors.forename: V
authors.initials: V
authors.lastname: Keppens
authors.forename: D
authors.initials: D
authors.lastname: Mandrus
authors.forename: M A
authors.initials: MA
authors.lastname: McGuire
authors.forename: B C
authors.initials: BC
authors.lastname: Sales
authors.forename: A S
authors.initials: AS
authors.lastname: Sefat
authors.forename: J
authors.initials: J
authors.lastname: Schmalian