Strain-engineering Mott-insulating La2CuO4

O. Ivashko (), M. Horio, W. Wan, N. B. Christensen, D. E. McNally, E. Paris, Y. Tseng, N. E. Shaik, H. M. Rønnow, H. I. Wei, C. Adamo, C. Lichtensteiger, M. Gibert, M. R. Beasley, K. M. Shen, J. M. Tomczak, T. Schmitt and J. Chang ()
Additional contact information
O. Ivashko: Universität Zürich
M. Horio: Universität Zürich
W. Wan: Technical University of Denmark
N. B. Christensen: Technical University of Denmark
D. E. McNally: Paul Scherrer Institut
E. Paris: Paul Scherrer Institut
Y. Tseng: Paul Scherrer Institut
N. E. Shaik: Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL)
H. M. Rønnow: Institute of Physics, École Polytechnique Fedérale de Lausanne (EPFL)
H. I. Wei: Cornell University
C. Adamo: Stanford University
C. Lichtensteiger: University of Geneva
M. Gibert: Universität Zürich
M. R. Beasley: Stanford University
K. M. Shen: Cornell University
J. M. Tomczak: Vienna University of Technology
T. Schmitt: Paul Scherrer Institut
J. Chang: Universität Zürich

Nature Communications, 2019, vol. 10, issue 1, 1-8

Abstract: Abstract The transition temperature Tc of unconventional superconductivity is often tunable. For a monolayer of FeSe, for example, the sweet spot is uniquely bound to titanium-oxide substrates. By contrast for La2−xSrxCuO4 thin films, such substrates are sub-optimal and the highest Tc is instead obtained using LaSrAlO4. An outstanding challenge is thus to understand the optimal conditions for superconductivity in thin films: which microscopic parameters drive the change in Tc and how can we tune them? Here we demonstrate, by a combination of x-ray absorption and resonant inelastic x-ray scattering spectroscopy, how the Coulomb and magnetic-exchange interaction of La2CuO4 thin films can be enhanced by compressive strain. Our experiments and theoretical calculations establish that the substrate producing the largest Tc under doping also generates the largest nearest neighbour hopping integral, Coulomb and magnetic-exchange interaction. We hence suggest optimising the parent Mott state as a strategy for enhancing the superconducting transition temperature in cuprates.

Date: 2019
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DOI: 10.1038/s41467-019-08664-6

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