Interplay of superconductivity and magnetism in FeSe${}_{1-x}$Te${}_x$ compounds. Pressure effects

Abstract

The influence of uniform pressures $P$ up to 5 kbar on the superconducting transition temperature $T_c$ was studied for the FeSe${}_{1-x}$Te${}_x$ ($x=0$, 0.85, 0.88 and 0.9) system. For the first time, we observed a change in sign of the pressure effect on $T_c$ when going from FeSe to tellurium rich alloys. This has allowed to specify the pressure derivative d$T_c$/d$P$ for the system as a function of composition. The observed dependence was compared with results of the {\em ab initio} calculations of electronic structure and magnetism of FeSe, FeTe and FeSe${}_{0.5}$Te${}_{0.5}$, and also with our recent experimental data on pressure effects on magnetic susceptibilities of FeSe and FeTe compounds in the normal state. This comparison demonstrates a competing interplay between superconductivity and magnetism in tellurium rich FeSe${}_{1-x}$Te${}_x$ compounds

7 pages, 6 figures

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Cited by in corpus (1)

• Correlation between Fermi surface reconstruction and superconductivity in pressurized FeTe0.55Se0.45