Preparation and superconductivity of iron selenide thin films

Han, Yu; Li, W Y; Cao, Lixin; Zhang, S; Xu, Bo; Zhao, Baozhi

doi:10.1088/0953-8984/21/23/235702

Cited by 86 publications

(107 citation statements)

References 22 publications

(23 reference statements)

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“…For example, Kumary et al 6) reported that the T c value of the film on SrTiO 3 (STO) was higher than on LaAlO 3 (LAO). In contrast, Han et al 7) reported an opposite result; the T c value on LAO was higher than that on STO. In addition, Bellingeri et al 8) thickness were fixed at 573 K and at approximately 50 nm, respectively.…”

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confidence: 88%

Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films

Imai

Akiike

Hanawa

et al. 2010

Appl. Phys. Express

111

129

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We have investigated the crystal structure and superconducting properties of thin films of FeSe 0.5 Te 0.5 grown on eight different substrates. Superconductivity is not correlated with the lattice mismatch, but rather it is correlated with the degree of in-plane orientation and with the lattice parameter ratio c/a. The best superconducting properties are observed in films on MgO and LaAlO 3 (T c zero of 9.5 K). TEM observation shows that the presence or absence of the amorphous-like layer at the substrate surface plays a key role in determining the structural and superconducting properties of the grown films.* E-mail address: imai@maeda1.c.u-tokyo.ac.jpAfter the discovery of superconductivity in F-doped LaFeAsO, 1) numerous studies on iron-based superconductors have been carried out. One common iron-based superconductor is FeSe with a superconducting transition temperature T c of 8 K, 2) and the partial substitution of Te for Se raises T c to a maximum of 14 K.3)This material has the tetragonal PbO-type structure, which is the simplest structure of all the iron-based superconductors. Thus, FeSe and related materials are considered the most suitable systems to investigate how superconductivity correlates to the crystal structures.Many studies on the film growth of FeSe 1-x Te x have already been reported. 4-11)However, the question of what substrates are suitable for the growth of thin FeSe 1-x Te x films remains controversial. For example, Kumary et al. 6) reported that the T c value of the film on SrTiO 3 (STO) was higher than on LaAlO 3 (LAO). In contrast, Han et al. 7)reported an opposite result; the T c value on LAO was higher than that on STO. In addition, Bellingeri et al. thickness were fixed at 573 K and at approximately 50 nm, respectively. The crystal structure and the orientation of the films were characterized by a θ-2θ and a 4-circle X-ray diffraction (XRD) using Cu Kα radiation at room temperature. We also performed a transmission electron microscopy (TEM) observation. The electrical resistivity (ρ) was measured by a four-terminal method from 2 to 300 K. Figure 1 shows the XRD patterns of the eight films. Except for a few unidentified peaks, only the 00l reflections of a tetragonal PbO-type structure are observed, which shows that the out-of-plane alignment is excellent. It should be noted that the c-axis orientation is observed even in the film prepared on the (0001) plane in hexagonal Al 2 O 3 , as shown in Fig. 1 (h). This indicates that the FeSe 1-x Te x films intrinsically favor two-dimensional growth. The temperature dependence of ρ is summarized in Fig. 2. As can be easily seen, the eight films exhibit a variety of ρ(T)behavior. Except for the film on Al 2 O 3 , the ρ value of these films at T = 300 K is

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confidence: 88%

Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films

Imai

Akiike

Hanawa

et al. 2010

Appl. Phys. Express

111

129

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“…12 The SrFe 2 As 2 :Co epitaxial films showed a superconducting transition at 20 K with a small magnetic field anisotropy. 13 After that, thin film growth of LaFeAsO 14 and Fe(Se, Te) [15][16][17][18][19] have been reported by other groups.…”

Section: Footnotesmentioning

confidence: 99%

Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped

Katase

Hiramatsu

Yanagi

et al. 2009

Solid State Communications

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“…The first report of thin film growth of FeSe was made by Han et al [83], which firstly appeared in the arXiv. They used off-stoichiometric [92].…”

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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Preparation and superconductivity of iron selenide thin films

Cited by 86 publications

References 22 publications

Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films

Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films

Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped

Comparative Review on Thin Film Growth of Iron-Based Superconductors

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Preparation and superconductivity of iron selenide thin films

Cited by 86 publications

References 22 publications

Systematic Comparison of Eight Substrates in the Growth of FeSe0.5Te0.5Superconducting Thin Films

Systematic Comparison of Eight Substrates in the Growth of FeSe0.5Te0.5Superconducting Thin Films

Atomically-flat, chemically-stable, superconducting epitaxial thin film of iron-based superconductor, cobalt-doped

Comparative Review on Thin Film Growth of Iron-Based Superconductors

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Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films

Systematic Comparison of Eight Substrates in the Growth of FeSe_0.5Te_0.5Superconducting Thin Films