Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe2Se3

Details Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe2Se3 Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe2Se3

2012-02-24

arxiv.org/abs/1202.5371v1

Phys. Rev. B 85, 064413 (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures

Scientific paper

Magnetism in the insulating BaFe$_2$Se$_3$ was examined through susceptibility, specific heat, resistivity and neutron diffraction measurements. After formation of a short-range magnetic correlation, a long-range ordering was observed below $T_{\rm N}\sim 255$ K. The transition is obscured by bulk properties. Magnetic moments ($\parallel a$) are arranged to form a Fe$_4$ ferromagnetic unit, and each Fe$_4$ stacks antiferromagnetically. This block magnetism is of the third type among magnetic structures of ferrous materials. The magnetic ordering drives unusually large distortion via magnetoelastic coupling.

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