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Using polarized neutron reflectometry we measured the neutron spin-dependent reflectivity from four LaAlO(3)/SrTiO(3) superlattices. Our results imply that the upper limit for the magnetization averaged over the lateral dimensions of the sample induced by an 11 T magnetic field at 1.7 K is less than 2 G. SQUID magnetometry of the neutron superlattice(More)
In systems with strong electron-lattice coupling, such as manganites, orbital degeneracy is lifted, causing a null expectation value of the orbital magnetic moment. Magnetic structure is thus determined by spin-spin superexchange. In titanates, however, with much smaller Jahn-Teller distortions, orbital degeneracy might allow non-zero values of the orbital(More)
Epitaxial interfaces between complex oxides are of increasing interest due to the possibility of tailoring their electronic structures to display novel behaviors and functionalities. At the interface between band insulators SrTiO3 (STO) and LaAlO3 (LAO), the polar discontinuity drives a charge-transfer process that causes the interface to become metallic(More)
We report angle resolved photoemission experiments on the electron doped Heisenberg antiferromagnet (Sr(1-x)La(x))(2)IrO(4). For a doping level of x=0.05, we find an unusual metallic state with coherent nodal excitations and an antinodal pseudogap bearing strong similarities with underdoped cuprates. This state emerges from a rapid collapse of the Mott gap(More)
An unusual conducting surface state can be produced in SrTiO3 substrates by irradiation with Argon ions from a plasma source, at low energy and high doses. The effects of irradiation are analyzed here by atomic force microscopy (AFM) and aberration corrected scanning transmission electron microscopy (STEM) combined with electron energy loss spectroscopy(More)
F. Y. Bruno,1 J. Tornos,1 M. Gutierrez del Olmo,1 G. Sanchez Santolino,1 N. M. Nemes,1 M. Garcia-Hernandez,2 B. Mendez,3 J. Piqueras,3 G. Antorrena,4 L. Morellón,4,5 J. M. De Teresa,5,6 M. Clement,7 E. Iborra,7 C. Leon,1 and J. Santamaria1 1GFMC, Departamento Fisica Aplicada III, Universidad Complutense de Madrid, E-28040 Madrid, Spain 2Instituto de Ciencia(More)
Surfaces and interfaces offer new possibilities for tailoring the many-body interactions that dominate the electrical and thermal properties of transition metal oxides. Here, we use the prototypical two-dimensional electron liquid (2DEL) at the SrTiO3(001) surface to reveal a remarkably complex evolution of electron-phonon coupling with the tunable carrier(More)
We report on the magnetic coupling of La0.7Sr0.3MnO3 layers through SrTiO3 spacers in La0.7Sr0.3MnO3/SrTiO3 epitaxial heterostructures. Combined aberration-corrected microscopy and electron-energy-loss spectroscopy evidence charge transfer to the empty conduction band of the titanate. Ti d electrons interact via superexchange with Mn, giving rise to a Ti(More)
A. Tamai, Q. S. Wu, I. Cucchi, F. Y. Bruno, S. Riccò, T. K. Kim, M. Hoesch, C. Barreteau, E. Giannini, C. Besnard, A. A. Soluyanov, and F. Baumberger Department of Quantum Matter Physics, University of Geneva, 24 Quai Ernest-Ansermet, 1211 Geneva 4, Switzerland Theoretical Physics and Station Q Zurich, ETH Zurich, 8093 Zurich, Switzerland Diamond Light(More)