Influence of interstitial Fe to the phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ single crystals

Abstract

Superconductivity (SC) with the suppression of long-range antiferromagnetic (AFM) order is observed in the parent compounds of both iron-based and cuprate superconductors. The AFM wave vectors are bicollinear ($\pi$, 0) in the parent compound FeTe different from the collinear AFM order ($\pi$, $\pi$) in most iron pnictides. Study of the phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ is the most direct way to investigate the competition between bicollinear AFM and SC. However, presence of interstitial Fe affects both magnetism and SC of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$, which hinders the establishment of the real phase diagram. Here, we report the comparison of doping-temperature ($x$-$T$) phase diagrams for Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ (0 $\le$ $x$ $\le$ 0.43) single crystals before and after removing interstitial Fe. Without interstitial Fe, the AFM state survives only for $x$ $<$ 0.05, and bulk SC emerges from $x$ = 0.05, and does not coexist with the AFM state. The previously reported spin glass state, and the coexistence of AFM and SC may be originated from the effect of the interstitial Fe. The phase diagram of Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$ is found to be similar to the case of the "1111" system such as LaFeAsO${}_{1-x}$F${}_x$, and is different from that of the "122" system.

arXiv comment20 pages, 6 figures

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• Comparative study of superconducting and normal-state anisotropy in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$ superconductors with controlled amounts of interstitial excess Fe
• Observation of robust edge superconductivity in Fe(Se,Te) under strong magnetic perturbation
• Molecular beam epitaxy of superconducting FeSe${}_x$Te${}_{1-x}$ thin films interfaced with magnetic topological insulators
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• Correlation between Fermi surface reconstruction and superconductivity in pressurized FeTe0.55Se0.45
• Acoustic lattice instabilities at the magneto-structural transition in Fe${}_{1.057(7)}$Te
• Electronic phase diagram in Te-annealed superconducting FeTe${}_{1-x}$Se${}_x$ revealed by magnetic susceptibility
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