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Condens. Matter 2017, 2(1), 4; doi:10.3390/condmat2010004

Titanium Pnictide Oxide Superconductors

Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
Academic Editor: Yoshikazu Mizuguchi
Received: 1 December 2016 / Revised: 30 December 2016 / Accepted: 3 January 2017 / Published: 12 January 2017
(This article belongs to the Special Issue Layered Superconductors)
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Abstract

In 2012, a novel superconductor BaTi2Sb2O was found in the layered titanium pnictide oxides ATi2Pn2O. A related superconductor BaTi2Bi2O was subsequently discovered in 2013. The structure of these materials consists of alternate stacking of superconducting Ti2Pn2O layers and Ba blocking layers, which is somewhat similar to high-Tc cuprates since the Ti2Pn2O layer contains an anti-CuO2-type Ti2O square lattice. In addition to the structural similarity to the well-known high-Tc superconductors, BaTi2Pn2O shows unique physical properties: two superconducting domes appear in the electronic phase diagram for solid solutions of BaTi2(Sb1‒xBix)2O and a unique density-wave instability which coexists with superconductivity. In this short review, the early studies of titanium pnictide oxides, the discovery of novel superconductors BaTi2Pn2O, and recent progress are summarized. View Full-Text
Keywords: titanium pnicide oxides; superconductivity; density-wave; d1 square lattice; mixed anion compounds; two-dome structure in Tc titanium pnicide oxides; superconductivity; density-wave; d1 square lattice; mixed anion compounds; two-dome structure in Tc
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Yajima, T. Titanium Pnictide Oxide Superconductors. Condens. Matter 2017, 2, 4.

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