Electronic Degeneracy and Intrinsic Magnetic Properties of Epitaxial Nb:SrTiO3 Thin Films Controlled by Defects

Sarantopoulos, A. ; Ferreiro-Vila, E. ; Pardo, V. ; Magén, C. (Universidad de Zaragoza) ; Aguirre, M.H. (Universidad de Zaragoza) ; Rivadulla, F.

Resumen: 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.

Idioma: Inglés

DOI: 10.1103/PhysRevLett.115.166801

Año: 2015

Publicado en: Physical Review Letters 115, 16 (2015), -
ISSN: 0031-9007

Factor impacto JCR: 7.645 (2015)

Categ. JCR: PHYSICS, MULTIDISCIPLINARY rank: 6 / 79 = 0.076 (2015) - Q1 - T1

Factor impacto SCIMAGO: 4.656 - Physics and Astronomy (miscellaneous) (Q1)

Financiación: info:eu-repo/grantAgreement/EC/FP7/259082/EU/Design of new thermoelectric devices based on layered and field modulated nanostructures of strongly correlated electron systems/2DTHERMS
Financiación: info:eu-repo/grantAgreement/ES/MINECO/MAT2013–44673-R

Tipo y forma: Artículo (Versión definitiva)

Área (Departamento): Área Física Materia Condensada (Dpto. Física Materia Condensa.)