Unabridged phase diagram for single-phased FeSexTe1-x thin films

Abstract

A complete phase diagram and its corresponding physical properties are essential prerequisites to understand the underlying mechanism of iron based superconductivity. For the structurally simplest 11 (FeSeTe) system, earlier attempts using bulk samples have not been able to do so due to the fabrication difficulties. Here, thin FeSexTe1-x films with the Se content covering the full range were fabricated by using pulsed laser deposition method. Crystal structure analysis shows that all films retain the tetragonal structure in room temperature. Significantly, the highest superconducting transition temperature (TC = 20 K) occurs in the newly discovered domain, 0.6 - 0.8. The single-phased superconducting dome for the full Se doping range is the first of its kind in iron chalcogenide superconductors. Our results present a new avenue to explore novel physics as well as to optimize superconductors.

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Cited by in corpus (8)

• Systematic study on transport properties of FeSe thin films with various degrees of strain
• FeTe${}_{0.55}$Se${}_{0.45}$: a multiband superconductor in the clean and dirty limit
• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Phase diagrams on composition-spread Fe${}_y$Te${}_{1-x}$Se${}_x$ films
• Investigation of Transport Properties for FeSe${}_{1-x}$Te${}_x$ Thin Films under Magnetic Fields
• Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTe${}_{0.55}$Se${}_{0.45}$
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Phase separation near the charge neutrality point in FeSe${}_{1-x}$Te${}_x$ crystals with x $<$ 0.15