Tuning the ground state of iron based superconductors by uniaxial strain

ORAL

Abstract

Uniaxial strain has emerged as a prominent tuning tool for accessing previously unexplored regions of phase space in quantum materials. In particular, in iron-based superconductors the susceptibility of the electronic structure to applied uniaxial strain has opened up new avenues to create and control varied quantum phases.
In our research programme, we have explored the magnetic and superconducting phase diagram under uniaxial strain along [110] crystallographic direction of FeTe. FeTe is an ‘11’ non-superconducting parent compound with double stripe AFM order ground state having (π,0) propagation vector contrary to the more typical (π, π) order. We combined low-temperature magnetoresistivity measurements in a force cell and direct spectroscopic imaging with STM, which revealed (π, π) ordering under uniaxial strain. In light of our results on this and other compounds we discuss the possibility of stabilising new order both on the surface and in bulk under experimentally accessible strains in iron-based superconductor.

*Acknowledge funding from EPSRC through EP/S005005/1

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Presenters

  • Soumendra Panja

    • School of Physics and Astronomy, University of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

Authors

  • Soumendra Panja

    • School of Physics and Astronomy, University of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

  • Craig Topping

    • School of Physics and Astronomy, University of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

  • Chi Ming Yim

    • Univ of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

  • Christopher Trainer

    • School of Physics and Astronomy, University of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

  • Dorina Croitori

    • Center for Electronic Correlations and Magnetism, Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany

  • Vladimir Tsurkan

    • University of Augsburg
    • Center for Electronic Correlations and Magnetism, University of Augsburg
    • Center for Electronic Correlations and Magnetism, Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany

  • Alois Loidl

    • University of Augsburg
    • Center for Electronic Correlations and Magnetism, University of Augsburg
    • Center for Electronic Correlations and Magnetism, Experimental Physics V, University of Augsburg, D-86159 Augsburg, Germany

  • Peter Wahl

    • Univ of St Andrews
    • School of Physics and Astronomy, University of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom

  • Andreas Rost

    • School of Physics and Astronomy, University of St Andrews
    • Univ of St Andrews
    • SUPA,School of Physics and Astronomy, University of St Andrews,, North Haugh, St Andrews, Fife KY16 9SS, United Kingdom