Iron-Based Chalcogenide Spin Ladder BaFe2X3 (X = Se,S)

  • Shan WuEmail author
  • Benjamin A. Frandsen
  • Meng Wang
  • Ming Yi
  • Robert Birgeneau
Original Paper


The relevance of magnetic, structural, orbital, and charge degrees of freedom in the iron-based superconductors (FeSCs) and related materials occupies a central focus in condensed matter physics. While the majority of iron-based materials exhibit the same two-dimensional iron square lattice structural motif, a family of AFe2X3 (X = Se,S) compounds introduces a quasi-one-dimensional (1D) ladder motif, which resembles the two-legged spin ladder copper oxide materials. Furthermore, unlike most parent compounds of FeSCs, the members of this spin ladder family are insulators. Recently, a superconducting transition has been observed under pressure with Tc up to 24 K, similar to the pressure-induced superconductivity in the copper oxide ladder Sr14−xCaxCu24O41 material, stimulating much interest. Here, we review the magnetic, structural, and electronic properties in this family, particularly in the BaFe2X3 series tuned by pressure and by chemical substitution. The established pressure-temperature (P-T) and carrier concentration-temperature (x-T) phase diagrams in related materials provide useful information to extend the variety of high-temperature superconductors and compare with other FeSCs. We also review some essential information about analogous square lattice FeSCs.


Iron-based high-temperature superconductors Iron-based chalcogenide Quasi-one-dimensional magnetism Spin ladder 



First of all, we would like to thank Ted Geballe for the inspiration that he has provided to all of us as physicists and as human beings. For one of us (RJB), our friendship with Ted has spanned five decades. For the rest of us, Ted has set an ideal example for our careers as physicists for the next five decades. Ted, thank you. We would also like to acknowledge all of the people who were responsible for the research cited in the references including especially our own collaborators who are too numerous to name individually here. Work at Lawrence Berkeley National Laboratory was funded by the US Department of Energy, Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division under Contract No. DE- 357 AC02-05-CH11231 within the Quantum Materials Program (KC2202).


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Authors and Affiliations

  1. 1.Department of PhysicsUniversity of CaliforniaBerkeleyUSA
  2. 2.Material Sciences DivisionLawrence Berkeley National LaboratoryCaliforniaUSA
  3. 3.Department of Physics and AstronomyBrigham Young UniversityProvoUSA
  4. 4.School of PhysicsSun Yat-Sen UniversityGuangzhouChina
  5. 5.Department of Physics and AstronomyRice UniversityHoustonUSA

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