title: Incommensurate charge order phase in Fe2OBO3 due to geometrical frustration.
abstract: The temperature dependence of charge order in Fe2OBO3 was investigated by resistivity and differential scanning calorimetry measurements, Mössbauer spectroscopy, and synchrotron x-ray scattering, revealing an intermediate phase between room temperature and 340 K, characterized by coexisting mobile and immobile carriers, and by incommensurate superstructure modulations with temperature-dependent propagation vector (1/2, 0, tau). The incommensurate modulations arise from specific antiphase boundaries with low energy cost due to geometrical charge frustration.
authors.affiliation: Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. angst@ornl.gov
authors.forename: M
authors.initials: M
authors.lastname: Angst
authors.forename: R P
authors.initials: RP
authors.lastname: Hermann
authors.forename: W
authors.initials: W
authors.lastname: Schweika
authors.forename: J-W
authors.initials: JW
authors.lastname: Kim
authors.forename: P
authors.initials: P
authors.lastname: Khalifah
authors.forename: H J
authors.initials: HJ
authors.lastname: Xiang
authors.forename: M-H
authors.initials: MH
authors.lastname: Whangbo
authors.forename: D-H
authors.initials: DH
authors.lastname: Kim
authors.forename: B C
authors.initials: BC
authors.lastname: Sales
authors.forename: D
authors.initials: D
authors.lastname: Mandrus