RT Journal Article
T1 Anisotropic magnetotransport in SrTiO3 surface electron gases generated by Ar+ irradiation
A1 Bruno, Flavio Yair
A1 Tornos Castillo, Javier
A1 Gutiérrez del Olmo, M.
A1 Sánchez Santolino, Gabriel
A1 Nemes, Norbert Marcel
A1 León Yebra, Carlos
A1 Santamaría Sánchez-Barriga, Jacobo
AB Metallic surface layers are fabricated by doping (100) SrTiO3 (STO) single crystals with oxygen vacancies generated by bombardment with Ar ions from an rf plasma source. The presence of oxygen vacancies is confirmed by cathodoluminescence and x-ray photoemission spectroscopy. This technique produces a surface electron gas with high values of the sheet carrier density (n2D = 2.45×1017 cm−2). A strong increase (300%) of the low-temperature magnetoresistance is observed when the magnetic field is rotated away from the surface, characteristic of orbital effects of confined electrons. We estimate the width of the confinement region to be in the 200–300 nm range. When a magnetic field is applied in the surface plane and parallel to the current direction, a large negative magnetoresistance is found below the structural transition of the STO, which is discussed in terms of spin-orbit scattering. On further reduction of temperature, there is a change to a positive magnetoresistance regime due to the scattering of charge carriers at the disordered surface region.
PB American Physical Society
SN 2469-9950
YR 2011
FD 2011
LK https://hdl.handle.net/20.500.14352/91157
UL https://hdl.handle.net/20.500.14352/91157
LA eng
NO F. Y. Bruno, J. Tornos, M. Gutierrez Del Olmo, G. Sanchez Santolino, N. M. Nemes, M. Garcia-Hernandez, B. Mendez, J. Piqueras, G. Antorrena, L. Morellón, J. M. De Teresa, M. Clement, E. Iborra, C. Leon, and J. Santamaria, Phys. Rev. B 83, 245120 (2011).
NO Ministerio de Ciencia, Innovación y Universidades (España)
NO Comunidad de Madrid
DS Docta Complutense
RD 15 abr 2025