Enhanced Superconductivity in Rock-Salt TiO

Dong Wang; Chong Huang; Jianqiao He; Xiangli Che; Hui Zhang; Fuqiang Huang

doi:10.1021/acsomega.7b00048

Enhanced Superconductivity in Rock-Salt TiO

ACS Omega. 2017 Mar 17;2(3):1036-1039. doi: 10.1021/acsomega.7b00048. eCollection 2017 Mar 31.

Authors

Dong Wang¹, Chong Huang¹, Jianqiao He¹, Xiangli Che¹, Hui Zhang¹, Fuqiang Huang^{1

2}

Affiliations

¹ State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, P. R. China.
² State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.

Abstract

Oxygen stoichiometry is critical for physical properties, but it is hard to precisely control in many multivalent transition metal oxides, for example, cuprate superconductors, magnetoresistive manganite oxides, and TiO _x (x < 2). We have developed a new method to synthesize rock-salt TiO in a sealed and evacuated quartz tube by using KClO₄ as the only oxygen source to react with elemental Ti (in a Ti/O molar ratio of 1:1). The stoichiometric titanium monoxide (TiO) exhibits an enhanced superconductivity transition temperature (T _c) of 5.5 K, which is superior to the reported results of 0.5-2.3 K. The new synthetic method provides an excellent way to prepare stoichiometric oxides, and the enhanced superconductivity of TiO may initialize the restudy of the transport properties of Ti-containing oxides.