Magnetic and electronic properties of surfaces, interfaces and multilayers

Our group focuses on the experimental studies of magnetic and orbital properties of multilayers, superlattices, and interfaces. We use resonant x-ray and neutron reflectometry to investigate orbital and magnetic reconstructions at the interfaces of correlated oxide heterostructures, e.g. consisting of YBa₂Cu₃O_6+y and La_1−xCa_xMnO₃ or LaNiO₃ and LaAlO₃. In particular, we apply the newly developed method of orbital reflectometry to study spatially resolved orbital polarization profiles in adjacent atomic layers of transition-metal-oxide superlattices. We collaborate closely with other groups within Keimer's department, with the Andersen's theory department, Technology Service Group as well as with external groups within the TRR 80 collaboration.

Recent Publications Polarity-driven nickel oxide precipitation in LaNiO3−LaAlO3 superlattices E. Detemple, Q. M. Ramasse, W. Sigle, G. Cristiani, H.-U. Habermeier, E. Benckiser, A. V. Boris, A. Frañó, P. Wochner, M. Wu, B. Keimer, and P. A. van Aken. Appl. Phys. Lett. 99 (2011), 211903 Temperature range of superconducting fluctuations above Tc in YBa2Cu3O7−δ single crystals M. S. Grbić, M. Požek, D. Paar, V. Hinkov, M. Raichle, D. Haug, B. Keimer, N. Barišić, A. Dulčić. Phys. Rev. B 83 (2011), 144508 Orbital reflectometry of oxide heterostructures E. Benckiser, M. W. Haverkort, S. Brück, E. Goering, S. Macke, A. Frañó, X. Yang, O. K. Andersen, G. Cristiani, H. U. Habermeier, A. V. Boris, I. Zegkinoglou, P. Wochner, H. J. Kim, V. Hinkov, B. Keimer. Nature Materials 10 (2011), 189−193 Evidence of a precursor superconducting phase at temperatures as high as 180 K in RBa2Cu3O7−δ (R = Y, Gd, Eu) superconducting crystals from infrared spectroscopy A. Dubroka, M. Roessle, K. W. Kim, V. K. Malik, D. Munzar, D. N. Basov, A. Schafgans, S. J. Moon, C. T. Lin, D. Haug, V. Hinkov, B. Keimer, Th. Wolf, J. G. Storey, J. L. Tallon, C. Bernhard. Phys. Rev. Lett. 106 (2011), 047006 Charge transport and magnetization profile at the interface between the correlated metal CaRuO3 and the antiferromagnetic insulator CaMnO3 J. W. Freeland, J. Chakhalian, A. V. Boris, J.-M. Tonnerre, J. J. Kavich, P. Yordanov, S. Grenier, P. Zschack, E. Karapetrova, P. Popovich, H. N. Lee, B. Keimer. Phys. Rev. B 81 (2010), 094414 Full list of publications...