title: Interface-Driven Ferromagnetism within the Quantum Wells of a Rare Earth Titanate Superlattice.
abstract: Here we present polarized neutron reflectometry measurements exploring thin film heterostructures composed of a strongly correlated Mott state, GdTiO_{3}, embedded with SrTiO_{3} quantum wells. Our results reveal that the net ferromagnetism inherent to the Mott GdTiO_{3} matrix propagates into the nominally nonmagnetic SrTiO_{3} quantum wells and tracks the magnetic order parameter of the host Mott insulating matrix. Beyond a well thickness of 5 SrO layers, the magnetic moment within the wells is dramatically suppressed, suggesting that quenched well magnetism comprises the likely origin of quantum critical magnetotransport in this thin film architecture. Our data demonstrate that the interplay between proximate exchange fields and polarity-induced carrier densities can stabilize extended magnetic states within SrTiO_{3} quantum wells.
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106-5050, USA.
authors.forename: R F
authors.initials: RF
authors.lastname: Need
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106-5050, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Isaac
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA.
authors.forename: B J
authors.initials: BJ
authors.lastname: Kirby
authors.affiliation: NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Borchers
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106-5050, USA.
authors.forename: S
authors.initials: S
authors.lastname: Stemmer
authors.affiliation: Materials Department, University of California, Santa Barbara, California 93106-5050, USA.
authors.forename: Stephen D
authors.initials: SD
authors.lastname: Wilson