Possible hydrogen doping and enhancement of Tc (= 35 K) in a LaFeAsO-based superconductor

Abstract

We report that the incorporation of hydroxide ions (OH)- significantly enhances the superconducting transition temperature (Tc) in the LnFeAsO-based superconductors (Ln1111: Ln = La, Ce and Pr). For La1111, Tc of the (OH)- incorporated sample synthesized using high-pressure technique becomes 35 K, which is higher by 7 K than the typical optimally-doped La1111 superconductors. Similar enhancement in Tc is also observed for Ce1111 and Pr1111. 1H-NMR measurement have confirmed the existence of hydrogen atoms in the samples. Accompanying the (OH)- incorporation, the lattice parameters are largely contracted, down to the values which have never been attained by any other dopings/substitutions.

8 pages, 5 figures, 1 table, Appl. Phys. Lett. to be published

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• Absence of an appreciable iron isotope effect on the transition temperature of the optimally doped SmFeAsO_{1-y} superconductor
• Superconductivity in Uncollapsed Tetragonal LaFe2As2
• Origin of Tc Enhancement Induced by Doping Yttrium and Hydrogen into LaFeAsO-based Superconductors: 57Fe, 75As, 139La, and 1H-NMR Studies
• Heavily Hydride-ion-doped 1111-type Iron-based Superconductors: Synthesis, Physical Properties and Electronic Structure
• High-Tc Nodeless s_\pm-wave Superconductivity in (Y,La)FeAsO_{1-y} with Tc=50 K: 75As-NMR Study
• Hidden robust presence of a hole Fermi surface in a heavily electron doped iron based superconductor LaFe${}_2$As${}_2$
• Synthesis of ErFeAsO-based superconductors by hydrogen doping method
• First-principles Studies for the Hydrogen Doping Effects on Iron-based Superconductors
• Novel Superconducting Phases in Copper Oxides and Iron-oxypnictides: NMR Studies
• Crossover between magnetism and superconductivity in low H-doped LaFeAsO