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TT: Fachverband Tiefe Temperaturen

TT 19: Low Dimensional Systems: Other Topics

TT 19.3: Vortrag

Montag, 16. März 2020, 17:30–17:45, HSZ 103

Signature of isotropic electric dipole dynamics in BaFe₂X₃ (X = S/Se) — •yuk tai chan¹, seulki roh¹, soohyeon shin^2,3, tuson park^2,3, martin dressel¹, and ece uykur¹ — ¹1. Physikalisches Institut, Universität Stuttgart, Germany — ²Department of Physics, Sungkyunkwan University, Suwon, Republic of Korea — ³Center for Quantum Materials and Superconductivity (CQMS), Sungkyunkwan University, Suwon, Republic of Korea

BaFe₂S₃ (BFS) and BaFe₂Se₃ (BFSe) hold a rare and interesting quasi-1D Fe-ladder structure. Although they are isostructual, magnetic ground states of these are significantly different: BFSe possesses a block-type antiferromagnetic (AFM) order along the leg with T_N ∼ 200 K, whereas BFS forms a stripe-type AFM order along the leg with T_N ∼ 100 K. The block-type AFM in BFSe has the potential to generate ferroelectric polarization and hence raise hope for a realization of robust multiferroic order. In this study, polarization-dependent dielectric spectroscopy has been performed on single crystals BFS and BFSe. Counterintuitive to the highly anisotropic quasi-1D structure, nearly isotropic relaxor ferroelectric behaviors are observed for both compounds. The range of temperature for the relaxation in BFSe is ∼ 100 K above that in BFS, which follows their AFM order, T_N, and therefore suggests a shrouded relationship between the magnetism and electric dipole dynamics.