title: In-plane anisotropy of the electronic structure for the charge- and orbital-ordered state in half-doped manganite with layered structure.
abstract: We report on the in-plane anisotropy of the electronic response in the spin-, charge-, and orbital-ordered phase of a half-doped layered-structure manganite. The optical conductivity spectra for a single domain of Eu1/2Ca3/2MnO4 unambiguously show the anisotropic charge dynamics which well corresponds to the theoretical calculation: the optical conductivity with the polarization along the zigzag ferromagnetic chain direction exhibits a smaller gap and a larger intensity at lower energies than that of the perpendicular polarization mostly due to the charge and orbital ordering and the associated quantum interference effect.
authors.affiliation: Spin Superstructure Project, ERATO, Japan Science and Technology Agency, Tsukuba 305-8562, Japan.
authors.forename: Y S
authors.initials: YS
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Onoda
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.forename: Y
authors.initials: Y
authors.lastname: Tokunaga
authors.forename: J P
authors.initials: JP
authors.lastname: He
authors.forename: Y
authors.initials: Y
authors.lastname: Kaneko
authors.forename: N
authors.initials: N
authors.lastname: Nagaosa
authors.forename: Y
authors.initials: Y
authors.lastname: Tokura