Iron isotope effect on the superconducting transition temperature and the crystal structure of FeSe_1-x

Abstract

The Fe isotope effect (Fe-IE) on the transition temperature T_c and the crystal structure was studied in the Fe chalcogenide superconductor FeSe_1-x by means of magnetization and neutron powder diffraction (NPD). The substitution of natural Fe (containing \simeq 92% of ^{56}Fe) by its lighter ^{54}Fe isotope leads to a shift of T_c of 0.22(5)K corresponding to an Fe-IE exponent of α_Fe=0.81(15). Simultaneously, a small structural change with isotope substitution is observed by NDP which may contribute to the total Fe isotope shift of T_c.

4 pages, 3 figures

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• Effect of nematic ordering on electronic structure of FeSe
• Enhanced Superconductivity on the Tetragonal Lattice in FeSe under Hydrostatic Pressure
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• Pressure induced magnetic order in FeSe
• Photoinduced ultrafast dynamics of local nematicity and lattice distortions in FeSe crystals
• Evolution of transport properties in FeSe thin flakes with thickness approaching the two-dimensional limit
• Magnetic tricritical point and nematicity in FeSe under pressure
• Basic electronic properties of iron selenide under variation of structural parameters
• On the phonon dispersion relation of single-crystalline $\beta$--FeSe
• Strongly correlated superconductor with polytypic 3D Dirac points
• Comment on "Isotope effect in multi-band and multi-channel attractive systems and inverse isotope effect in iron-based superconductors" by T. Yanagisawa, et al
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• Anomalous isotope effect in BCS superconductors with two boson modes
• 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
• Normal state magnetotransport properties of $\beta$-FeSe superconductors