Study of the pressure on magnetism in spin-ladder superconductor BaFe<sub>2</sub>Se<sub>3</sub>

ORAL

Abstract

Magnetic fluctuations were proposed as important for the pairing glue to the unconventional superconductivity (SC). The proximity of an antiferromagnetic (AFM) ordered has been found ubiquitously, with the majority of the iron-based superconductors exhibiting the same two-dimensional square lattice structural motif. Optimal SC typically appears when the magnetic order is suppressed by applying pressure or doping carriers. Pressure-induced SC in the BaFe2X3 (X=Se,S) introduces a quasi-one-dimensional prototype for the studies of the unconventional SC[1,2]. BaFe2Se3 shows a block-type AFM transition below TN = 256 K. By applying pressure, the Mott insulating state is gradually suppressed and displays a SC dome above 10 Gpa similar to the BaFe2S3. In this talk, I will present a systematic study of the magnetic and structural properties under hydrostatic pressure in BaFe2Se3 using neutron diffraction, x-ray diffraction and muon spin relaxation techniques. These provide the information on how the magnetic phase evolves approaching the SC and compares to the case of BaFe2S3.[1]H. Takahashi,et al.,Nat. Mater.(2018).[2]J.J. Ying,et al.,PRB (2017).

*This work is funded by the U.S. DOE,Office of Basic Energy Sciences under Contract No. DE-AC02-05-CH11231

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Presenters

  • Shan Wu

    • Physics, University of California, Berkeley
    • University of California, Berkeley

Authors

  • Shan Wu

    • Physics, University of California, Berkeley
    • University of California, Berkeley

  • Robert J Birgeneau

    • University of California, Berkeley
    • Physics, University of California, Berkeley
    • Univ. of California, Berkeley
    • Physics, University of California Berkeley

  • Junjie Yin

    • Sun Yat-Sen University

  • Meng Wang

    • Sun Yat-Sen University

  • Benjamin Frandsen

    • Brigham Young University
    • Physics and Astronomy, Brigham Young University

  • Tom Forrest

    • Diamond light source

  • Craig L. Bull

    • ISIS Facility, Rutherford Appleton Laboratory
    • ISIS Neutron and Muon Source

  • Nick Funnell

    • ISIS Facility, Rutherford Appleton Laboratory

  • Gediminas Simutis

    • Laboratory of Muon Spin Spectroscopy, Paul Scherrer Institute
    • Paul Scherrer Institute

  • Rustem Khasanov

    • Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute
    • Paul Scherrer Institut
    • Paul Scherrer Institute
    • Paul Sherrer Institut
    • PSI, 5232 Villigen, Switzerland

  • Thomas Smart

    • University of California, Berkeley
    • Earth and Planetary Science, University of California, Berkeley

  • Martin Kunz

    • Advanced Light Source, Lawrence Berkeley

  • Andrew Doran

    • Advanced Light Source, Lawrence Berkeley