title: Anisotropic electrical resistance in mesoscopic LaAlO3/SrTiO3devices with individual domain walls.
abstract: The crystal structure of bulk SrTiO3(STO) transitions from cubic to tetragonal at around 105 K. Recent local scanning probe measurements of LaAlO3/SrTiO3(LAO/STO) interfaces indicated the existence of spatially inhomogeneous electrical current paths and electrostatic potential associated with the structural domain formation in the tetragonal phase of STO. Here we report a study of temperature dependent electronic transport in combination with the polarized light microscopy of structural domains in mesoscopic LAO/STO devices. By reducing the size of the conductive interface to be comparable to that of a single tetragonal domain of STO, the anisotropy of interfacial electron conduction in relationship to the domain wall and its direction was characterized between T = 10-300 K. It was found that the four-point resistance measured with current parallel to the domain wall is larger than the resistance measured perpendicular to the domain wall. This observation is qualitatively consistent with the current diverting effect from a more conductive domain wall within the sample. Among all the samples studied, the maximum resistance ratio found is at least 10 and could be as large as 105at T = 10 K. This electronic anisotropy may have implications on other oxide hetero-interfaces and the further understanding of electronic/magnetic phenomena found in LAO/STO.
authors.affiliation: Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Nicholas J
authors.initials: NJ
authors.lastname: Goble
authors.affiliation: Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Richard
authors.initials: R
authors.lastname: Akrobetu
authors.affiliation: MINES Paris Tech, PSL Research University, MAT - Centre des matériaux, CNRS UMR 7633, BP 87 91003 Evry, France.
authors.forename: Hicham
authors.initials: H
authors.lastname: Zaid
authors.affiliation: Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Sukrit
authors.initials: S
authors.lastname: Sucharitakul
authors.affiliation: MINES Paris Tech, PSL Research University, MAT - Centre des matériaux, CNRS UMR 7633, BP 87 91003 Evry, France.
authors.forename: Marie-Hélène
authors.initials: MH
authors.lastname: Berger
authors.affiliation: Department of Materials Science and Engineering, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Alp
authors.initials: A
authors.lastname: Sehirlioglu
authors.affiliation: Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA.
authors.forename: Xuan P A
authors.initials: XP
authors.lastname: Gao