title: Ambipolar gate effect and low temperature magnetoresistance of ultrathin La0.8Ca0.2MnO3 films.
abstract: Ultrathin La(0.8)Ca(0.2)MnO(3) films have been measured in a field-effect geometry. The gate electric field produces a significant ambipolar decrease in resistance at low temperatures. This is attributed to the development of a pseudogap in the density of states and the coupling of localized charge to strain. Within a mixed phase scenario, the gate effect and magnetoresistance are interpreted in the framework of a "general susceptibility," which describes how phase boundaries move through a hierarchical pinning landscape.
authors.affiliation: School of Physics and Astronomy, University of Minnesota, 116 Church St. SE, Minneapolis, Minnesota 55455, USA.
authors.forename: M
authors.initials: M
authors.lastname: Eblen-Zayas
authors.forename: A
authors.initials: A
authors.lastname: Bhattacharya
authors.forename: N E
authors.initials: NE
authors.lastname: Staley
authors.forename: A L
authors.initials: AL
authors.lastname: Kobrinskii
authors.forename: A M
authors.initials: AM
authors.lastname: Goldman