Carefully controlled interfaces between two materials can give rise to novel physical phenomena and functionalities not exhibited by either of the constituent materials alone. Modern synthesis methods have yielded high-quantum heterostructures and superlattices of oxide materials with competing quantum many-body states. In order to explore new correlation-driven interface phenomena, our group seeks to understand and manipulate spin, charge and orbital order at oxide interfaces.

Recent focus areas and key publications

Control of electronic correlations in nickelate superlattices

Tunable spin and charge order
M. Hepting, M. Minola, A. Frano, G. Cristiani, G. Logvenov, E. Schierle, M. Wu, M. Bluschke, E. Weschke, H.-U. Habermeier, E. Benckiser, M. Le Tacon, and B. Keimer.
Phys. Rev. Lett. 113, 227206, published 26 November 2014

Layer Selective Control of the Lattice Structure in Oxide Superlattices
Alex Frano, Eva Benckiser, Yi Lu, Meng Wu, Miguel Castro-Colin, Manfred Reehuis, Alexander V. Boris, Eric Detemple, Wilfried Sigle, Peter van Aken, Georg Cristiani, Gennady Logvenov, Hanns-Ulrich Habermeier, Peter Wochner, Bernhard Keimer, Vladimir Hinkov.

Advanced Materials, published 24 October 2013
Strain and composition dependence of the orbital polarization in nickelate superlattices
M. Wu, E. Benckiser, M. W. Haverkort, A. Frano, Y. Lu, N. Nwanko, S. Brück, P. Audehm, E. Goering, S. Mache, V. Hinkov, P. Wochner, G. Christiani, S. Heinze, G. Logvenov, H.-U. Habermeier, B. Keimer.
Phys. Rev. B 88 125124, published 16 September 2013

Orbital control of noncollinear magnetic order in nickelate heterostructures
A. Frano, E. Schierle, M. W. Haverkort, Y. Lu, M. Wu, S. Blanco-Canosa, U. Nwankwo, A. V. Boris, P. Wochner, G. Cristiani, H. U. Habermeier, G. Logvenov, V. Hinkov, E. Benckiser, E. Weschke, B. Keimer. Phys.
Rev. Lett. 111, 106804, published 05 September 2013

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; published 22 November 2011.

Dimensionality Control of Electronic Phase Transitions in Nickel-Oxide Superlattices
A. V. Boris, Y. Matiks, E. Benckiser, A. Frañó, P. Popovich, V. Hinkov, P. Wochner, M. Castro-Colin, E. Detemple, V. K. Malik, C. Bernhard, T. Prokscha, A. Suter, Z. Salman, E. Morenzoni, G. Cristiani, H.-U. Habermeier, B. Keimer.
Science 332 (2011), 937−940; published 20 May 2011.

Supporting Online Material
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; published online 6 February 2011.
Supplementary information

Superlattices of Oxide Ferromagnets and Superconductors

Long-range transfer of electron-phonon coupling in oxide superlattices
N. Driza, S. Blanco-Canosa, M. Bakr, S. Soltan, M. Khalid, L. Mustafa, K. Kawashima, G. Christiani, H.-U. Habermeier, G. Khaliullin, C. Ulrich, M. Le Tacon, B. Keimer.
Nature Materials 11 (2012), 675; published 15 July 2012.

Thermoelectric properties of YBa2Cu3O7−La2/3Ca1/3MnO3 superlattices
S. Heinze, H.-U. Habermeier, G. Cristiani, S. Blanco Canosa, M. Le Tacon, B. Keimer.
Appl. Phys. Lett. 101 (2012) 131603; published 26 September 2012.

Magnetic Proximity Effect in YBa2Cu3O7/La2/3Ca1/3MnO3 and YBa2Cu3O7/LaMnO3+δ Superlattices
D. K. Satapathy, M. A. Uribe-Laverde, I. Marozau, V. K. Malik, S. Das, Th. Wagner, C. Marcelot, J. Stahn, S. Brück, A. Rühm, S. Macke, T. Tietze, E. Goering, A. Frañó, J.-H. Kim, M. Wu, E. Benckiser, B. Keimer, A. Devishvili, B. P. Toperverg, M. Merz, P. Nagel, S. Schuppler, C. Bernhard.
Phys. Rev. Lett. 108 (2012), 197201; published 7 May 2012.

Interface magnetism and ferroelectricity

Electric-Field-Induced Polar Order and Localization of the Confined Electrons in LaAlO3/SrTiO3 Heterostructures
M. Rössle, K. W. Kim, A. Dubroka, P. Marsik, C. N. Wang, R. Jany, C. Richter, J. Mannhart, C. W. Schneider, A. Frañó, P. Wochner, Y. Lu, B. Keimer, D. K. Shukla, J. Strempfer, C. Bernhard.
Phys. Rev. Lett. 110 (2013) 136805; published 27 March 2013.

Competing interactions at the interface between ferromagnetic oxides revealed by spin-polarized neutron reflectometry
J.-H. Kim, I. Vrejoiu, Y. Khaydukov, T. Keller, J. Stahn, A. Rühm, D. K. Satapathy, V. Hinkov, B. Keimer.
Phys. Rev. B 86 (2012) 180402(R); published 8 November 2012.
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