Yusuke Nambu

Pressure-induced superconductivity in the iron-based ladder material BaFe2S3.

All the iron-based superconductors identified so far share a square lattice composed of Fe atoms as a common feature, despite having different crystal structures. In copper-based materials, the superconducting phase emerges not only in square-lattice structures but also in ladder structures. Yet iron-based superconductors without a square-lattice motif have not been found, despite being actively sought out. Here, we report the discovery of pressure-induced superconductivity in the iron-based spin-ladder material BaFe2S3, a Mott insulator with striped-type magnetic ordering below ∼120 K. On the application of pressure this compound exhibits a metal-insulator transition at about 11 GPa, followed by the appearance of superconductivity below Tc = 14 K, right after the onset of the metallic phase. Our findings indicate that iron-based ladder compounds represent promising material platforms, in particular for studying the fundamentals of iron-based superconductivity.

Ferroquadrupolar ordering in PrTi 2 Al 20

The origin of the nonmagnetic phase transition in PrTi

Spin dynamics and spin freezing behavior in the two-dimensional antiferromagnet Ni Ga 2 S 4 revealed by Ga-NMR, NQR and μ SR measurements

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Novel Geometrical Frustration Effects in the Two-Dimensional Triangular-Lattice Antiferromagnet NiGa2S4 and Related Compounds

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Block magnetism coupled with local distortion in the iron-based spin-ladder compound BaFe 2 Se 3

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Crystal growth, structure, and physical properties of Ln(Cu,Al)12 (Ln = Y, Ce, Pr, Sm, and Yb) and Ln(Cu,Ga)12 (Ln = Y, Gd–Er, and Yb)

, reported earlier in a macroscopic study, has been asserted microscopically using elastic and inelastic neutron scattering techniques. It has been shown spectroscopically that the crystalline-electric-field ground state is a nonmagnetic

Incommensurate magnetism in FeAs strips: neutron scattering from CaFe(4)As(3).

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Two-dimensional magnetism and spin-size effect in the S = 1 triangular antiferromagnet NiGa2S4

doublet, whereas the excited states are two triplets (

Pressure Dependence of Electrical Transport in the Triangular Antiferromagnetic Insulators FeGa2S4 and Fe2Ga2S5

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Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice

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