title: Electronic Degeneracy and Intrinsic Magnetic Properties of EpitaxialNb: SrTiO3 Thin Films Controlled by Defects.
abstract: We report thermoelectric power experiments in e-doped thin films of SrTiO3 (STO) which demonstrate that the electronic band degeneracy can be lifted through defect management during growth. We show that even small amounts of cationic vacancies, combined with epitaxial stress, produce a homogeneous tetragonal distortion of the films, resulting in a Kondo-like resistance upturn at low temperature, large anisotropic magnetoresistance, and nonlinear Hall effect. Ab initio calculations confirm a different occupation of each band depending on the degree of tetragonal distortion. The phenomenology reported in this Letter for tetragonally distorted e-doped STO thin films, is similar to that observed in LaAlO3/STO interfaces and magnetic STO quantum wells.
authors.affiliation: Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain.
authors.forename: A
authors.initials: A
authors.lastname: Sarantopoulos
authors.affiliation: Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain.
authors.forename: E
authors.initials: E
authors.lastname: Ferreiro-Vila
authors.affiliation: Departamento de Física Aplicada, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.|Instituto de Investigacións Tecnolóxicas, Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
authors.forename: V
authors.initials: V
authors.lastname: Pardo
authors.affiliation: Laboratorio de Microscopás Avanzadas, Instituto de Nanociencia de Aragón, Universidad de Zaragoza, 50018 Zaragoza, Spain.|Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain.|Fundación ARAID, 50018 Zaragoza, Spain.
authors.forename: C
authors.initials: C
authors.lastname: Magén
authors.affiliation: Laboratorio de Microscopás Avanzadas, Instituto de Nanociencia de Aragón, Universidad de Zaragoza, 50018 Zaragoza, Spain.|Departamento de Física de la Materia Condensada, Universidad de Zaragoza, 50009 Zaragoza, Spain.
authors.forename: M H
authors.initials: MH
authors.lastname: Aguirre
authors.affiliation: Centro de Investigación en Química Biológica y Materiales Moleculares (CIQUS), Universidad de Santiago de Compostela, 15782-Santiago de Compostela, Spain.
authors.forename: F
authors.initials: F
authors.lastname: Rivadulla