TY - JOUR
T1 - Polar state induced by block-type lattice distortions in BaFe2Se3 with quasi-one-dimensional ladder structure
AU - Aoyama, Takuya
AU - Imaizumi, Satoshi
AU - Togashi, Takuya
AU - Sato, Yoshifumi
AU - Hashizume, Kazuki
AU - Nambu, Yusuke
AU - Hirata, Yasuyuki
AU - Matsubara, Masakazu
AU - Ohgushi, Kenya
N1 - Funding Information:
We are grateful to T. Yamauchi, D. Okuyama, F. Du, T. J. Sato, M. Avdeev, and T. Hawai for experimental help and fruitful discussions. The present work is financially supported by JSPS KAKENHI Grants No. 16K17732, No. 16H01062, No. 18H04302, No. 17H05474, No. 16H04019, No. 18H01159, No. 16H04007, No. 17H05473, No. 17H06137, and No. 17H04844, Research Foundation for Opto-Science and Technology, Murata Science Foundation, and Mitsubishi Foundation. This work was partially performed using facilities of the Institute for Solid State Physics, the University of Tokyo.
PY - 2019/6/19
Y1 - 2019/6/19
N2 - 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.
AB - 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.
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U2 - 10.1103/PhysRevB.99.241109
DO - 10.1103/PhysRevB.99.241109
M3 - Article
AN - SCOPUS:85068617855
VL - 99
JO - Physical Review B
JF - Physical Review B
SN - 2469-9950
IS - 24
M1 - 241109
ER -