Analysis of FeySe1 −xTexthin films grown by radio frequency sputtering

Speller, Susannah; Aksoy, Canan; Saydam, M.; Taylor, Helen; Burnell, Gavin; Boothroyd, A. T.; Grovenor, C.R.M.

doi:10.1088/0953-2048/24/7/075023

Cited by 24 publications

(31 citation statements)

References 38 publications

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“…• C, again for 12 h. There is very limited mention of superconducting films grown by other common techniques, such as molecular beam epitaxy [27,28], metalorganic chemical vapor deposition (MOCVD) [29] and sputtering [30]. Recently, very thick (thickness 100 µm) superconducting films of FeSe (T onset c = 8 K) were successfully deposited by electrochemical route [31].…”

Section: Synthesis Morphology and Crystalline Structurementioning

confidence: 99%

Superconducting properties of iron chalcogenide thin films

Mele

2012

Science and Technology of Advanced Materials

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Iron chalcogenides, binary FeSe, FeTe and ternary FeTe x Se 1−x , FeTe x S 1−x and FeTe:O x , are the simplest compounds amongst the recently discovered iron-based superconductors. Thin films of iron chalcogenides present many attractive features that are covered in this review, such as: (i) easy fabrication and epitaxial growth on common single-crystal substrates; (ii) strong enhancement of superconducting transition temperature with respect to the bulk parent compounds (in FeTe 0.5 Se 0.5 , zero-resistance transition temperature T bulk c0 = 13.5 K, but T film c0 = 19 K on LaAlO 3 substrate); (iii) high critical current density (J c ∼ 0.5 × 10 6 A cm 2 at 4.2 K and 0 T for FeTe 0.5 Se 0.5 film deposited on CaF 2 , and similar values on flexible metallic substrates (Hastelloy tapes buffered by ion-beam assisted deposition) with a weak dependence on magnetic field; (iv) high upper critical field (∼50 T for FeTe 0.5 Se 0.5 , B c2 (0), with a low anisotropy, γ ∼ 2). These highlights explain why thin films of iron chalcogenides have been widely studied in recent years and are considered as promising materials for applications requiring high magnetic fields (20-50 T) and low temperatures (2-10 K).

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Section: Synthesis Morphology and Crystalline Structurementioning

confidence: 99%

Superconducting properties of iron chalcogenide thin films

Mele

2012

Science and Technology of Advanced Materials

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“…Having demonstrated the effectiveness of the use of the Fe-buffer layer in the growth of Co-doped BaFe 2 As 2 thin films [54,55] [107,108]. There are also attempts to grow FeSe films by electrochemical techniques [109][110][111][112][113][114] and chemical vapor deposition techniques [115,116].…”

Section: -Systemmentioning

confidence: 99%

Comparative Review on Thin Film Growth of Iron-Based Superconductors

2017

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Abstract:Since the discovery of the novel iron-based superconductors, both theoretical and experimental studies have been performed intensively. Because iron-based superconductors have a smaller anisotropy than high-T c cuprates and a high superconducting transition temperature, there have been a lot of researchers working on the film fabrication of iron-based superconductors and their application. Accordingly, many novel features have been reported in the films of iron-based superconductors, for example, the fabrication of the epitaxial film with a higher T c than bulk samples, the extraction of the metastable phase which cannot be obtained by the conventional solid state reaction, and so on. In this paper, we review the progress of research on thin film fabrications of iron-based superconductors, especially the four categories: LnFeAs(O,F) (Ln = Lanthanide), AEFe 2 As 2 (AE = Alkaline-earth metal), FeCh (Ch = Chalcogen), and FeSe monolayer. Furthermore, we focus on two important topics in thin films of iron-based superconductors; one is the substrate material for thin film growth on the iron-based superconductors, and the other is the whole phase diagram in FeSe 1−x Te x which can be obtained only by using film-fabrication technique.

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“…30,31 To see crystallinity variation of the SC films with the substrate temperatures, the ω rocking curves of the (001) peak are measured for the three samples as shown in FIG.4(b). The full width at half maximum (FWHM) of the peaks change apparently from SC1 through SC3.…”

Section: Surface Morphology Evolution With Thickness-by Sem Measurmentioning

confidence: 99%

Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films

et al. 2015

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A series of iron based Fe-Te-Se superconductor thin films depositing on 0.7wt% Nb-doped SrTiO3 at substrate temperatures in the 250°C -450°C range by pulsed laser ablation of a constituents well defined precursor FeTe0.55Se0.55 target sample. We study the possible growth mechanism and its influence on the superconductor properties. Experimental results indicate the superconductive and non-superconductive properties are modulated only by the thickness of the thin films through the temperature range. The films appear as superconductor whenever the thickness is above a critical value ∼30nm and comes to be non-superconductor below this value. Relative ratios of Fe to (Te+Se) in the films retained Fe/(Te+Se)<1 for superconductor and Fe/(Te+Se)>1 for non-superconductor no matter what the film growth temperature was. The effect of film growth temperature takes only the role of modulating the ratio of Te/Se and improving crystallinity of the systems. According to the experimental results we propose a sandglass film growth mechanism in which the interfacial effect evokes to form a Fe rich area at the interface and Se or Te starts off a consecutive filling up process of chalcogenide elements defect sides, the process is significant before the film thickness reaches at ∼30nm.

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Analysis of Fe_ySe_{1 −x}Te_xthin films grown by radio frequency sputtering

Cited by 24 publications

References 38 publications

Superconducting properties of iron chalcogenide thin films

Superconducting properties of iron chalcogenide thin films

Comparative Review on Thin Film Growth of Iron-Based Superconductors

Impact of thickness on microscopic and macroscopic properties of Fe-Te-Se superconductor thin films

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