Magnetic Precursor of the Pressure-Induced Superconductivity in Fe-Ladder Compounds

Songxue Chi, Yoshiya Uwatoko, Huibo Cao, Yasuyuki Hirata, Kazuki Hashizume, Takuya Aoyama, Kenya Ohgushi

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    Abstract

    The pressure effects on the antiferromagentic orders in iron-based ladder compounds CsFe2Se3 and BaFe2S3 have been studied using neutron diffraction. With identical crystal structure and similar magnetic structures, the two compounds exhibit highly contrasting magnetic behaviors under moderate external pressures. In CsFe2Se3 the ladders are brought much closer to each other by pressure, but the stripe-type magnetic order shows no observable change. In contrast, the stripe order in BaFe2S3 undergoes a quantum phase transition where an abrupt increase of Néel temperature by more than 50% occurs at about 1 GPa, accompanied by a jump in the ordered moment. With its spin structure unchanged, BaFe2S3 enters an enhanced magnetic phase that bears the characteristics of an orbital selective Mott phase, which is the true neighbor of superconductivity emerging at higher pressures.

    Original languageEnglish
    Article number047003
    JournalPhysical Review Letters
    Volume117
    Issue number4
    DOIs
    StatePublished - Jul 21 2016

    Funding

    Research at Oak Ridge National Laboratory's HFIR was sponsored by the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. This work was supported by JSPS KAKENHI Grant No.16H04019. K. O. acknowledges fruitful discussions with Hiroki Takahashi, Touru Yamauchi, and Fei Du. This Letter has been authored by UT-Battelle, LLC under Contract No. DE- AC05-00OR22725 with the U.S. Department of Energy.

    FundersFunder number
    Office of Basic Energy Sciences
    Scientific User Facilities Division
    U.S. Department of Energy
    Oak Ridge National Laboratory
    Japan Society for the Promotion of Science16H04019, AC05-00OR22725

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