Superconductivity in titanium-based pnictide oxide compounds

Abstract

Superconductivity in a novel class of layered materials, Ti-based pnictide oxides, was recently discovered. These compounds have attracted interest since they combine features of copper oxide and iron pnictide superconductors. Here the transition metal (titanium) forms two-dimensional Ti${}_2$O layers (anti structure to the CuO${}_2$ planes), capped by pnictogen ions (similar to Fe${}_2$As${}_2$ layers). The pnictide oxide compounds show a spin or charge density wave phase which coexists with superconductivity in some members of the family. Unlike the cuprates, but similar to iron pnictides, the parent compounds of pnictide oxides are metals with specific nesting properties of the Fermi surface which leads to the density wave instability. The nature of the superconductivity, coexisting with the density wave order, and the possible competition or mutual interaction between both states is one of the central questions of recent studies. This short review summarizes the current knowledge from an experimental as well as theoretical point of view and discusses some of the open questions and possible future developments.

Preprint of a review article submitted for consideration in International Journal of Modern Physics B, \c{opyright} 2014 [copyright World Scientific Publishing Company], http://www.worldscientific.com/worldscinet/ijmpb, 25 pages, 14 figures

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• Synthesis, Structural, and Transport Properties of Cr-doped BaTi_2As_2O
• Commensurate lattice distortion in the layered titanium oxypnictides Na${}_2$Ti${}_{2}P{n}_2$O ($Pn=$ As, Sb) determined by X-ray diffraction
• New phase transition in Na${}_2$Ti${}_2$As${}_2$O revealed by Raman scattering
• Internal static electric and magnetic field at the copper cite in a single crystal of the electron-doped high-T${}_c$ superconductor Pr${}_{1.85}$Ce${}_{0.15}$CuO${}_{4-y}$
• Theory for doping trends in titanium oxypnictide superconductors