This Science News Wire page contains a press release issued by an organization and is provided to you "as is" with little or no review from Science X staff.

Protonation induced high-Tc phases in iron-based superconductors

January 18th, 2018
Protonation induced high-Tc phases in iron-based superconductors
Electric-field-controlled modulation of physical properties of materials via ionic evolution is a recent fascinating and fast developing research frontier, due to its novel phase modulation and potential applications in batteries, intelligent glass, fuel cells and etc. In a work published as cover article of Science Bulletin recently, researchers reported their efforts to implant protons into iron-based superconductors, using ionic liquids as the electrical medium. Credit: Science China Press

Electric-field-controlled modulation of physical properties of materials via ionic evolution is a recent fascinating and fast developing research frontier, due to its novel phase modulation and potential applications in batteries, intelligent glass, fuel cells and etc. In a work published as cover article of Science Bulletin recently, researchers reported their efforts to implant protons into iron-based superconductors, using ionic liquids as the electrical medium.

They have succeeded in implanting protons into the 11 and the 122 structural compounds. Protonation induces bulk superconductivity with Tc at 20 K in undoped BaFe2As2, and two high-Tc phases with Tc at 42.5 K and 20 K in FeSe0.93S0.07, and enhances Tc from 4 K to 18 K in FeS. As a significant example, proton NMR measurements in FeS are enabled with evidences of unconventional superconductivity, overcoming the difficulty of lacking sensitive NMR isotopes.

Therefore, protons serve a double role of dopant for carrier doping and a sensitive NMR isotope in bulk materials. This protonation methodology is easy to operate, could be immediately applicable to a wide range of materials for exploring insulating, metallic, or superconducting phases, and allows for rich bulk spectroscopic studies in the emergent phases.

Protonation induced high-Tc phases in iron-based superconductors
The illustration of the protonation setup (left), the proton NMR spectra of a Hx-FeSe0.93S0.07 single crystal at different temperatures (top right), and the ac susceptibility of the same sample as a function of temperature (bottom right). Credit: Science China Press

More information:
Yi Cui et al, Protonation induced high- T c phases in iron-based superconductors evidenced by NMR and magnetization measurements, Science Bulletin (2017). DOI: 10.1016/j.scib.2017.12.009

Provided by Science China Press

Citation: Protonation induced high-Tc phases in iron-based superconductors (2018, January 18) retrieved 20 February 2025 from https://sciencex.com/wire-news/277713221/protonation-induced-high-tc-phases-in-iron-based-superconductors.html
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.
Back to list