Experimentelle Physik IV

    Neutron and resonant x-ray spectroscopy in correlated materials

    In our group we investigate complex, functional materials such as transition metal oxides, which are used in the emerging field of correlated nanoelectronics. Unlike with conventional semiconductors, exotic superconducting, orbital and magnetic states can be realized at the interfaces in layered structures comprising such materials. Examples include the LaAlO3 - SrTiO3 interface, at which both superconductivity and magnetism are observed, and at which electronically active structures can be “written” and “erased”, as well as LaCoO3, which undergoes various interface modifications and magnetizations upon strained growth on substrates with different lattice constants.

    We investigate such structures both experimentally using neutron and resonant x-ray scattering, and with computer simulations, and the exchange of ideas with theoreticians is an integral part of our work. We closely collaborate with groups in Würzburg and with colleagues at the University of British Columbia in Vancouver, the Canadian Light Source, the BESSY synchrotron in Berlin and the MPI-Stuttgart.

    Master thesis topics are available. We offer opportunities for research visits in the institutions mentioned above and are committed to supervision.

    Selected publications

    Chemical and valence reconstruction at the surface of SmB6  revealed by means of resonant soft x-ray reflectometry
    V. B. Zabolotnyy, K. Fürsich, R. J. Green, P. Lutz, K. Treiber, Chul-Hee Min, A. V. Dukhnenko, N. Y. Shitsevalova, V. B. Filipov, B. Y. Kang, B. K. Cho, R. Sutarto, Feizhou He, F. Reinert, D. Inosov, and V. Hinkov
    Phys. Rev. B 97, 205416 (2018) (Editors' Suggestion). Published 14. May 2018

    Theory-restricted resonant x-ray reflectometry of quantum materials
    K. Fürsich, V. B. Zabolotnyy, E. Schierle, L. Dudy, O. Kirilmaz, M. Sing, R. Claessen, R. J. Green, M. W. Haverkort, and V. Hinkov
    Phys. Rev. B 97, 165126 (2018). Published 16. April 2018

    Valence-state reflectometry of complex oxide heterointerfaces
    J. E. Hamann-Borrero, S. Macke, W. S. Choi, R. Sutarto, F. He, A. Radi, I. Elfimov, R. J. Green, M. W. Haverkort, V. B. Zabolotnyy, H. N. Lee, G. A. Sawatzky, and V. Hinkov
    Nature Quantum Materials 1, 16013 (2016). Published 16. September 2016

    63Cu-NMR study of oxygen disorder in ortho-II YBa2Cu3Oy
    T. Wu, R. Zhou, M. Hirata, I. Vinograd, H. Mayaffre, R. Liang, W. N. Hardy, D. A. Bonn, T. Loew, J. Porras, D. Haug, C. T. Lin, V. Hinkov, B. Keimer, and M.-H. Julien
    Phys. Rev. B 93, 134518 (2016). Published 28. April 2016.

    Influence of the Fermi Surface Morphology on the Magnetic Field-Driven Vortex Lattice Structure Transitions in YBa2Cu3O7−d: d = 0, 0.15
    N. G. Leos, J. S. White, J. A. Lim, J. L. Gavilano, B. Delley, L. Lemberger, A. T. Holmes, M. Medarde, T. Loew, V. Hinkov, C. T. Lin, M. Laver, C. D. Dewhurst, and E. M. Forgan
    Journal of the Physical Society of Japan 84, 044709 (2015). Published 13. March 2015.

    Element specific monolayer depth profiling
    S. Macke, A. Radi, J. E. Hamann-Borrero, Adriano Verna, M. Bluschke, S. Brück, E. Goering, R. Sutarto, F. He, G. Cristiani, M. Wu, E. Benckiser, H.-U. Habermeier, G. Logvenov, N. Gauquelin, G. A. Botton, A. P. Kajdos, S. Stemmer, G. A. Sawatzky, M. W. Haverkort, B. Keimer, and V. Hinkov
    Advanced Materials 26, 6554 (2014). Published 9. October 2014.

    Layer selective control of the lattice structure in oxide superlattices
    A. Frañó, E. Benckiser, Y. Lu, M. Wu, M. Castro-Colin, M. Reehuis, A. V. Boris, E. Detemple, W. Sigle, P. van Aken, G. Cristiani, G. Logvenov, H. U. Habermeier, P. Wochner, B. Keimer, and V. Hinkov
    Advanced Materials 26, 258 (2014). Published 15. January 2014.

    Orbital control of non collinear magnetic order in nickel oxide heterostructures
    A. Frañó, 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, and B. Keimer
    Phys. Rev. Lett. 111, 106804 (2013). Published 5. September 2013.

    Older publications

    Dispersive spin excitations in highly overdoped cuprates revealed by resonant inelastic x-ray scattering

    T. Wu, H. Mayaffre, S. Krämer, M. Horvatic, C. Berthier, C. T. Lin, D. Haug, T. Loew, V. Hinkov, B. Keimer, and M.-H. Julien
    Phys. Rev. B 88, 014511 (2013). Published 12. July 2013.

    Possible realization of an antiferromagnetic Griffiths phase in Ba(Fe1-xMnx)2As2

    D. S. Inosov, G. Friemel, J. T. Park, A. C. Walters, Y. Texier, Y. Laplace, J. Bobroff, V. Hinkov, D. L. Sun, Y. Liu, R. Khasanov, K. Sedlak, Ph. Bourges, Y. Sidis, A. Ivanov, C. T. Lin, T. Keller, and B. Keimer
    Phys. Rev. B 87, 224425 (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, 180402 (2012).

    Pseudogap in the chain states of YBCO

    V. B. Zabolotnyy, A. A. Kordyuk, D. V. Evtushinsky, V. N. Strocov, L. Patthey, T. Schmitt, D. Haug, C. T. Lin, V. Hinkov, B. Keimer, B. Büchner, S. V. Borisenko
    Phys. Rev. B 85, 064507 (2012).

    Intense paramagnon excitations in a large family of high-temperature superconductors

    M. Le Tacon, G. Ghiringhelli, J. Chaloupka, M. Moretti Sala, V. Hinkov, M. W. Haverkort, M. Minola, M. Bakr, K. J. Zhou, S. Blanco-Canosa, C. Monney, Y. T. Song, G. L. Sun, C. T. Lin, G. M. De Luca, M. Salluzzo, G. Khaliullin, T. Schmitt, L. Braicovich, B. Keimer.
    Nature Physics 7, 725 (2011).

    A crossover from weak to strong pairing in unconventional superconductors

    D. S. Inosov, J. T. Park, A. Charnukha, Yuan Li, A. V. Boris, B. Keimer, V. Hinkov.
    Phys. Rev. B 83, 214520 (2011)

    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, 189−193 (2011).

    Weak superconducting pairing and a single isotropic energy gap in stoichiometric LiFeAs

    D. S. Inosov, J. S. White, D. V. Evtushinsky, I. V. Morozov, A. Cameron, U. Stockert, V. B. Zabolotnyy, T. K. Kim, A. A. Kordyuk, S. V. Borisenko, E. M. Forgan, R. Klingeler, J. T. Park, S. Wurmehl, A. N. Vasiliev, G. Behr, C. D. Dewhurst, V. Hinkov.
    Phys. Rev. Lett. 104 (2010), 187001

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    Lehrstuhl für Experimentelle Physik IV
    Am Hubland
    97074 Würzburg

    Phone: +49 931 31-89726
    Fax: +49 931 31-84921

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