Absence of an appreciable iron isotope effect on the transition temperature of the optimally doped SmFeAsO_{1-y} superconductor

Abstract

We report the iron (Fe) isotope effect on the transition temperature (Tc) in the oxygen-deficient SmFeAsO_{1-y}, a 50 K-class Fe-based superconductor. For the optimally-doped samples with Tc = 54 K, change of the Fe average atomic mass (MFe) causes a negligibly small shift in Tc, with the Fe isotope coefficient (alphaFe) as small as -0.024 \pm 0.015. This result contrasts with the finite, inverse isotope shift observed in optimally-doped (Ba,K)Fe2As2, indicating that the contribution of the electron-phonon interaction markedly differs between these two Fe-based high-Tc superconductors.

arXiv comment14 pages, 4 Figures

References in corpus (7)

• Boron Isotope Effect in Superconducting MgB${}_2$
• A Large Iron Isotope Effect in SmFeAsO1-xFx and Ba1-xKxFe2As2
• Inverse Iron Isotope Effect on the transition temperature of the (Ba,K)Fe2As2 superconductor
• Superconductivity above 50K in LnFeAsO1-y (Ln= Nd, Sm, Gd, Tb and Dy) Synthesized by High-pressure Technique
• Oxygen isotope effect on superconductivity and magnetism in Y_1-xPr_xBa_2Cu_3O_7-δ
• Possible hydrogen doping and enhancement of Tc (= 35 K) in a LaFeAsO-based superconductor
• Raman spectra in iron-based quaternary CeO${}_{1-x}$F${}_x$FeAs and LaO${}_{1-x}$F${}_x$FeAs

Cited by in corpus (15)

• The Puzzle of High Temperature Superconductivity in Layered Iron Pnictides and Chalcogenides
• Superconductivity in Iron Compounds
• High-temperature superconductivity in iron-based materials
• Hydrogen in layered iron arsenide: indirect electron doping to induce superconductivity
• Orbital Fluctuation Theory in Iron Pnictides: Effects of As-Fe-As Bond Angle, Isotope Substitution, and $Z^2$-Orbital Pocket on the Superconductivity
• Intrinsic and structural isotope effects in Fe-based superconductors
• Multi-Band Superconductivity and the Steep Band -- Flat Band Scenario
• Heavily Hydride-ion-doped 1111-type Iron-based Superconductors: Synthesis, Physical Properties and Electronic Structure
• Synthesis of ErFeAsO-based superconductors by hydrogen doping method
• A New Iron Pnictide Oxide (Fe2As2)(Ca5(Mg,Ti)4Oy) and a New Phase in Fe-As-Ca-Mg-Ti-O system
• First-principles Studies for the Hydrogen Doping Effects on Iron-based Superconductors
• Influence of multiorbitals and anisotropic Coulomb interactions on isotope effect coefficient in doped Fe-based superconductors
• Isotope effect on the transition temperature $T_c$ in Fe-based superconductors: the current status
• Lattice expansion from isotope substitution in the Iron based superconductors
• Highly Correlated Electron State and High-Temperature Superconductivity in Iron Pnictides