Polar state induced by block-type lattice distortions in BaFe2Se3 with quasi-one-dimensional ladder structure

Takuya Aoyama, Satoshi Imaizumi, Takuya Togashi, Yoshifumi Sato, Kazuki Hashizume, Yusuke Nambu, Yasuyuki Hirata, Masakazu Matsubara, Kenya Ohgushi

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

A stripe-type magnetic structure and related orbital ordering are universally observed in iron-based superconductors. As an exception, the quasi-one-dimensional ladder material BaFe2Se3, which shows pressure-induced superconductivity, exhibits a block-type antiferromagnetic ordering. The research of the electronic and structural properties in BaFe2Se3 at ambient conditions is important to reveal the origin of multiorbital superconductivity. Here, we report the temperature-dependent crystal structure of BaFe2Se3, combining optical second harmonic generation experiments and neutron diffraction measurements. We elucidate the crystal structure with the Pmn21 space group in the lowerature phase below Ts2=400 K, further above the Néel temperature. This lowerature phase loses spatial inversion symmetry, where a resultant macroscopic polarization emerges along the rung direction. The transition is characterized by block-type lattice distortions possibly accompanied by polar orbital ordering.

Original languageEnglish
Article number241109
JournalPhysical Review B
Volume99
Issue number24
DOIs
Publication statusPublished - 2019 Jun 19

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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