Contact

    Clifford Hicks, PhD
    Phone: +49 351 4646-3227
    Fax: +49 351 4646-3232
    Matthias Vojta, Prof.Dr.
    Phone: +49 351 463 34135
    Fax: +49 351 463 37185

    Response of High-Temperature Superconductors to Lattice Distortion

    The two famous classes of high-temperature superconductors are the cuprate and the iron-based superconductors. Superconductivity in the cuprate superconductors is intertwined with a variety of other electronic orders, including charge density wave and spin density wave orders. By “intertwining,” we mean that we know the possible orders strongly affect each other, but we are not certain how. Anisotropic lattice distortion can help us understand how the multiple orders interact, by shifting the balance between them. The iron-based superconductors, on the other hand, have comparatively simpler phase diagrams, and have been found to respond extremely sensitively to anisotropic lattice distortion.

    In this project, you will study the response of copper- and/or iron-based superconductors to uniaxial pressure, through transport and magnetic susceptibility measurements. This project will likely involve shaping small samples with a focused ion beam, to achieve high surface quality and so reach the highest possible uniaxial pressures before the sample fractures. This project will also likely involve working with collaborators at MPI-FKF in Stuttgart, and at the Karlsruhe Institute of Technology.

    Left: an example of microstructuring a sample for measurements under uniaxial pressure. Right: <em>T</em><sub>c</sub> versus strain along the a axis of YBa<sub>2</sub>Cu<sub>3</sub>O<sub>6+x</sub>
    Left: an example of microstructuring a sample for measurements under uniaxial pressure. Right: Tc versus strain along the a axis of YBa2Cu3O6+x
     
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