The effect of titanium and oxygen on Fe Te Se superconductors

International Conference and Exhibition on Mesoscopic & Condensed Matter Physics

June 22-24, 2015 Boston, USA

A S Abouhaswa1, A I Merentsov1,2 and N V Baranov1,2

1Ural Federal University, Russia 2Institute of Metal Physics UB RAS, Russia

Posters-Accepted Abstracts: J Material Sci Eng

Abstract :

Since the discovery of Fe-based superconductors, muchefforts have been focused on search for new superconductivity in related compounds. The aim of this work is to minimize the amount of iron oxide phase in Fe (Se,Te) superconducting materials by titanium doping. We have chosen material Fe1.02 Se0.5 Te0.5 as initial because of the highest Tc in the range of Fe (Se,Te) materials. Polycrystalline samples with nominal compositions Fe1.02 TixTe0.5 Se0.5 were prepared by a solid state reaction method. The samples were characterized using x-ray diffraction (Bruker D8 ADVANCE), EDS analysis (AURIGA Crossbeam Workstation, Carl Zeiss), electrical resistivity and magnetization measurements (MPMS XL7 EC, Quantum Design). Electrical resistivity of the samples has been measured two times: the first time immediately after preparation and the second one after one week stay on the air. We found that increase of titanium content leads to the decrease of the Tc for the first time. After one weak on air the Tc becomes higher and increases together with titanium content. The possible explanation is the formation of titanium oxide except iron oxide during the preparation and formation of iron oxide with excess iron during the stay on the air. The results of research were obtained in the framework of the state assignment of the Ministry of Education and Science of Russia.

Biography :

Email: aliabohaswa@hotmail.com