Superconducting phase diagram of In_xWO₃ synthesized by indium deintercalation

¹ Department of Chemistry, Princeton University - Princeton, NJ 08544, USA

^(a) : Department of Physicas, University of Tokyo - Hongo 7-3-1, Bunkyo-ku, Tokyo 133-0033, Japan; dhirai@qmat.phys.s.u-tokyo.ac.jp

Received: 21 June 2013
Accepted: 25 June 2013

Abstract

We report the superconducting phase diagram of the hexagonal tungsten bronze (HTB) In_xWO₃. The In_xWO₃ samples were prepared by indium deintercalation of the thermodynamically stable parent phase In_0.33WO₃. By employing this technique, a lowest indium content in the HTB phase of was achieved, which cannot be obtained by conventional solid-state reaction. In addition, accurately and reproducibly controlled indium content and homogeneous samples enable us to perform a systematic study of the physical properties of In_xWO₃. Most of the In_xWO₃ samples exhibit a superconducting transition and the highest transition temperature in In_xWO₃ was observed at . The indium content dependence of shows remarkable similarities to other M_xWO₃ ( and Rb) HTBs. Our results reveal the universality of physical properties in the HTB family and give a strategy to achieve higher in HTBs.