title: Photorefractive effect in the relaxor ferroelectric material 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3.
abstract: The photorefractive effect in a nominally undoped 0.91Pb(Zn1/3Nb2/3)O3-0.09PbTiO3 single crystal is measured. We report what is, to our knowledge, the first observation of the photorefractive effect in Pb-based relaxor ferroelectric crystals. The crystal is grown by the flux solution method. Then it is cut into a 2 mm x 4 mm x 8 mm piece and electrically poled along the [111] direction. The coupling constant of the two-wave mixing is 17 cm(-1), and the normalized time constant under 1-W/cm(2) illumination is 12 s at a wave-length of 476 nm. The effective trap density is calculated as 5 x 10(16) cm(-3) from the Debye screening length under the assumption of Kukhtarev's band-transport model. The dominant carrier is identified to be holes from the direction of two-wave mixing energy transfer.
authors.affiliation: Institute of Industrial Science, University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan.
authors.forename: Saori
authors.initials: S
authors.lastname: Abe
authors.forename: Tomoyasu
authors.initials: T
authors.lastname: Fujishima
authors.forename: Takashi
authors.initials: T
authors.lastname: Tsubone
authors.forename: Ryushi
authors.initials: R
authors.lastname: Fujimura
authors.forename: Hidenobu
authors.initials: H
authors.lastname: Ono
authors.forename: Osamu
authors.initials: O
authors.lastname: Matoba
authors.forename: Katsuroh
authors.initials: K
authors.lastname: Oda
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Shimura
authors.forename: Kazuo
authors.initials: K
authors.lastname: Kuroda