title: Charge/orbital ordering structure of Pr(1-x)Ca(x)MnO(3)(x = 3/8) examined by low-temperature transmission electron microscopy.
abstract: The structural phase transition of Pr(1-x)Ca(x)MnO(3)(x = 3/8) was investigated by means of low-temperature transmission electron microscopy. Superlattice reflection spots with a modulation wave vector q(1) = (0,1/2,0) appeared below 230 K, indicating formation of the d(3x(2-r(2))/d(3y(2)-r(2)) type of charge/orbital ordering. Below 150 K, a new series of superlattice reflection spots with a modulation wave vector q(2) = (1/4,1/4,1/2) appeared, suggesting an additional ordering of excess 1/8 Mn(3+), necessary due to the deviation of x from 1/2, with the occupation of the d(3z(2-r(2)) type of e(g) orbital.
authors.affiliation: Advanced Materials Laboratory, National Institute for Materials Science, Tsukuba 305-0044, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Asaka
authors.forename: S
authors.initials: S
authors.lastname: Yamada
authors.forename: S
authors.initials: S
authors.lastname: Tsutsumi
authors.forename: C
authors.initials: C
authors.lastname: Tsuruta
authors.forename: K
authors.initials: K
authors.lastname: Kimoto
authors.forename: T
authors.initials: T
authors.lastname: Arima
authors.forename: Y
authors.initials: Y
authors.lastname: Matsui