title: Interlayer coherence and superconducting condensate in the c-axis response of optimally doped Ba(Fe(1-x)Co(x))2As2 high-T(c) superconductor using infrared spectroscopy.
abstract: We report on the infrared studies of the interlayer charge dynamics of a prototypical pnictide superconductor Ba(Fe(0.926)Co(0.074))(2)As(2). We succeeded in probing the intrinsic interlayer response by performing infrared experiments on the crystals with a cleaved ac surface. Our experiments identify the coexistence of the suppression of the electronic spectral weight and the development of a coherent Drude-like response in the normal state. The formation of the interlayer condensate is clearly observed in the superconducting state and appears to be linked to coherent contribution to the normal-state conductivity.
authors.affiliation: Department of Physics, University of California, San Diego, La Jolla, California 92093, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Moon
authors.forename: A A
authors.initials: AA
authors.lastname: Schafgans
authors.forename: M A
authors.initials: MA
authors.lastname: Tanatar
authors.forename: R
authors.initials: R
authors.lastname: Prozorov
authors.forename: A
authors.initials: A
authors.lastname: Thaler
authors.forename: P C
authors.initials: PC
authors.lastname: Canfield
authors.forename: A S
authors.initials: AS
authors.lastname: Sefat
authors.forename: D
authors.initials: D
authors.lastname: Mandrus
authors.forename: D N
authors.initials: DN
authors.lastname: Basov