Band structure of pnictides: effects of crystal symmetry and pressure

 · Invited

Abstract

Even after ten years of intensive studies of iron-based superconductors these remarkable materials still remain enigmatic due to their large structural variety and a complex interplay of magnetism and superconductivity. Recently discovered AeAFe4As4 (1144) pnictides revealed new exciting phenomena, such as the spin-vortex magnetism [1] and pressure-induced half-collapse transitions [2], that originate from the special crystal symmetry.

In this talk, the effects of pressure and structural symmetry on the electronic properties of these 1144 materials are addressed from first principles. We focus here on the general trends in this pnictide family and compare them with the 122-type pnictides. Our simulations [3] show the importance of spin-vortex fluctuations and a high tunability of magnetism and superconductivity in these systems.

This work was done in collaboration with Peter Orth (Ames Laboratory), Seok-Woo Lee (University of Connecticut), Rafael Fernandes (University of Minnesota) and Cristian Batista (University of Tennessee).

References
1. W.R. Meier et al., Nat. Quant. Mat. 3, 5 (2018).
2. U.S. Kaluarachchi et al., PRB 96, 140501(R) (2017).
3. V. Borisov, P. C. Canfield, R. Valenti, PRB 98, 064104 (2018). Editors' Suggestion.

*VB and RV acknowledge the support by the Deutsche Forschungsgemeinschaft. VB was funded in part by the Gordon and Betty Moore Foundation EPiQS Initiative through Grant GBMF4411. PCC was supported by the U.S. DOE, BES Contract No. DE-AC02-07CH11358.

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Presenters

  • Vladislav Borisov

    • Institute of Theoretical Physics, Goethe University Frankfurt, Frankfurt am Main, Germany.

Authors

  • Vladislav Borisov

    • Institute of Theoretical Physics, Goethe University Frankfurt, Frankfurt am Main, Germany.

  • Paul Canfield

    • Ames Laboratory and Dept. of Physics, Iowa State University
    • Ames Laboratory, U.S. DOE, Iowa State University, Ames, Iowa 50011, USA.
    • Ames Laboratory
    • Iowa State University
    • Department of Physics, Iowa State University, Ames Laboratory, Ames, Iowa 50011, USA
    • Ames Laboratory, Iowa State University
    • Ames Laboratory/Iowa State University
    • Iowa State University and Ames Laboratory
    • Ames Laboratory and Iowa State University, Ames, IA, USA
    • Ames Laboratory and Dept. of Phys. and Astro.,, Iowa State Univ.
    • Ames Laboratory and Department of Physics & Astronomy, Iowa State University, Ames, IA 50010, USA
    • Ames Lab & Dept of Physics and Astronomy, Iowa State University
    • Department of Physics & Astronomy, Iowa State University
    • Department of physics and astronomy, Iowa State University/Ames Laboratory
    • Physics, Iowa State University/Ames Laboratory
    • Ames Laboratory & Iowa State University
    • Physics, Iowa State University

  • Roser Valenti

    • Institute of Theoretical Physics, Goethe University Frankfurt, Frankfurt am Main, Germany.
    • Institut für Theoretische Physik Goethe Universität Frankfurt am Mai
    • Goethe University Frankfurt
    • Physics, Goethe University Frankfurt
    • Institute for Theoretical Physics, Goethe University Frankfurt