This review shows the highlights of a 4-year-long research project supported by the
Japanese Government to explore new superconducting materials and relevant functional …

Over the past decade, topological materials—in which the topology of electron bands in the
bulk material leads to robust, unconventional surface states and electromagnetism—have …

The discovery of new extended structures has often led to the development of new fields in
chemistry and physics. However, the numerous combinations of metals (or cations) to yield …

The phononic and electronic properties of newly discovered quaternary superconductor
ThMo 2 Si 2 C are reported based on the results of first-principles calculations. The phonon …

We have recently reported two superconductors with the square lattice, BaTi2Sb2O (K) and
BaTi2Bi2O (K). In order to find a clue behind the superconductivity of these materials, we …

We have performed an isovalent substitution study in a layered titanium oxypnictide system
BaTi 2 (Sb 1− x Bi x) 2 O (0⩽ x⩽ 0.40) by measurements of x-ray diffraction, electrical …

We report the solid-state synthesis of all eighteen layered oxide chalcogenides in the
structural family AM 2 Q 2 O (A= K/Rb/Cs; M= Ti/V; Q= S/Se/Te), allowing the determination …

Spin-driven nematicity, or the breaking of the point-group symmetry of the lattice without long-
range magnetic order, is clearly quite important in iron-based superconductors. From a …

Uncovering the origin of unconventional superconductivity is often plagued by the
overwhelming material diversity with varying normal and superconducting (SC) properties …

Heteroanionic compounds, which host two or more different anions, have appeared as a
huge family of functional materials. Different from polyanionic compounds, there is no direct …