title: Domain wall conductivity in La-doped BiFeO3.
abstract: The transport physics of domain wall conductivity in La-doped bismuth ferrite (BiFeO3) has been probed using variable temperature conducting atomic force microscopy and piezoresponse force microscopy in samples with arrays of domain walls in the as-grown state. Nanoscale current measurements are investigated as a function of bias and temperature and are shown to be consistent with distinct electronic properties at the domain walls leading to changes in the observed local conductivity. Our observation is well described within a band picture of the observed electronic conduction. Finally, we demonstrate an additional degree of control of the wall conductivity through chemical doping with oxygen vacancies, thus influencing the local conductive state.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA.
authors.forename: J
authors.initials: J
authors.lastname: Seidel
authors.forename: P
authors.initials: P
authors.lastname: Maksymovych
authors.forename: Y
authors.initials: Y
authors.lastname: Batra
authors.forename: A
authors.initials: A
authors.lastname: Katan
authors.forename: S-Y
authors.initials: SY
authors.lastname: Yang
authors.forename: Q
authors.initials: Q
authors.lastname: He
authors.forename: A P
authors.initials: AP
authors.lastname: Baddorf
authors.forename: S V
authors.initials: SV
authors.lastname: Kalinin
authors.forename: C-H
authors.initials: CH
authors.lastname: Yang
authors.forename: J-C
authors.initials: JC
authors.lastname: Yang
authors.forename: Y-H
authors.initials: YH
authors.lastname: Chu
authors.forename: E K H
authors.initials: EK
authors.lastname: Salje
authors.forename: H
authors.initials: H
authors.lastname: Wormeester
authors.forename: M
authors.initials: M
authors.lastname: Salmeron
authors.forename: R
authors.initials: R
authors.lastname: Ramesh