title: Incoherent c-axis interplane response of the iron chalcogenide FeTe(0.55)Se(0.45) superconductor from infrared spectroscopy.
abstract: We report on the interplane c-axis electronic response of FeTe(0.55)Se(0.45) investigated by infrared spectroscopy. We find that the normal-state c-axis electronic response of FeTe(0.55)Se(0.45) is incoherent and bears significant similarities to those of mildly underdoped cuprates. The c-axis optical conductivity σ(c)(ω) of FeTe(0.55)Se(0.45) does not display well-defined Drude response at all temperatures. As temperature decreases, σ(c)(ω) is continuously suppressed. The incoherent c-axis response is found to be related to the strong dissipation in the ab-plane transport: a pattern that holds true for various correlated materials as well as FeTe(0.55)Se(0.45).
authors.affiliation: Department of Physics, University of California, San Diego, La Jolla, California 92093, USA. sjmoon@physics.ucsd.edu
authors.forename: S J
authors.initials: SJ
authors.lastname: Moon
authors.forename: C C
authors.initials: CC
authors.lastname: Homes
authors.forename: A
authors.initials: A
authors.lastname: Akrap
authors.forename: Z J
authors.initials: ZJ
authors.lastname: Xu
authors.forename: J S
authors.initials: JS
authors.lastname: Wen
authors.forename: Z W
authors.initials: ZW
authors.lastname: Lin
authors.forename: Q
authors.initials: Q
authors.lastname: Li
authors.forename: G D
authors.initials: GD
authors.lastname: Gu
authors.forename: D N
authors.initials: DN
authors.lastname: Basov