title: Observation of a pressure-induced As-As hybridization associated with a change in the electronic state of Fe in the tetragonal phase of EuFe2As2.
abstract: The electronic and vibrational properties of EuFe(2)As(2) in the tetragonal phase between 0 and 5 GPa have been investigated using (57)Fe Mössbauer spectroscopy and (57)Fe nuclear resonance inelastic scattering, respectively. We find a discontinuous increase of the center shift around 2.3 GPa, reflecting a change of the electronic state of Fe, and above 2.5 GPa a softening of the optical phonon modes associated with an increase of the relative volume of the FeAs(4) tetrahedron in the unit cell. Our findings reveal that an effective As-As hybridization along the c axis appears at approximately 2.3 GPa in the tetragonal phase of EuFe(2)As(2), along with a change in the electronic state of Fe, causing bulk superconductivity to appear at a low temperature. Consequently, the change in the electronic state of the Fe atom and the effective As-As hybridization play key roles in the pressure-induced superconductivity in the tetragonal phase of AFe(2)As(2).
authors.affiliation: Graduate School of Material Science, University of Hyogo, Japan. kobayash@sci.u-hyogo.ac.jp
authors.forename: Hisao
authors.initials: H
authors.lastname: Kobayashi
authors.forename: Shugo
authors.initials: S
authors.lastname: Ikeda
authors.forename: Yui
authors.initials: Y
authors.lastname: Sakaguchi
authors.forename: Yoshitaka
authors.initials: Y
authors.lastname: Yoda
authors.forename: Hiroki
authors.initials: H
authors.lastname: Nakamura
authors.forename: Masahiko
authors.initials: M
authors.lastname: Machida
mesh_terms: D001151:Arsenic / Q000737:chemistry*; D001665:Binding Sites; D004579:Electron Transport; D005063:Europium / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D008422:Materials Testing; D011312:Pressure
chemical_list: D005063:Europium; D007501:Iron; D001151:Arsenic