Chemical Composition Control at the Substrate Interface as the Key for FeSe Thin-Film Growth

Obata, Yukiko; Sato, Michiko; Yamaguchi, Yukuya; Karateev, Igor A.; Pavlov, Ivan; Vasiliev, Alexander L.; Haindl, S.

doi:10.1021/acsami.1c14451

Cited by 7 publications

(4 citation statements)

References 38 publications

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“…Since these particles are on a nanoscale, directly determining their composition is rather challenging. However, few micrometer-scale particles were identified as Se-rich and extremely Fe-rich according to the EDS result (not shown here), and the Se-rich particles were also observed in the FeSe films deposited by PLD [13]. Therefore, it can be inferred that these nanoscale particles observed in AFM diagrams are non-stoichiometric and non-superconducting.…”

Section: Resultsmentioning

confidence: 59%

“…research and practical applications [2,8]. Pulsed laser deposition (PLD) is one of the most common methods to prepare 11-type Fe-based superconducting films [9][10][11][12][13], and involves many preparation parameters, including substrate temperature (T s ), target to substrate distance, laser fluence and so on. These preparation parameters jointly determine the properties of the films [14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique

Zhang,

He,

et al. 2024

Supercond. Sci. Technol.

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The superconductivity of FeSeTe films, deposited by the pulsed laser deposition (PLD), is extremely sensitive to the preparation conditions. Hence, it is necessary to study the growth mechanism and reveal the key factors affecting the superconductivity of FeSeTe films. Among all the preparation conditions, the substrate temperature (Ts) is one of the most critical one because it can alter the diffusion and nucleation of deposited atoms, as well as subsequent secondary volatilization. In this study, we prepared a series of FeSeTe films deposited on CaF2 substrates with Ts ranging from 25 ℃ to 700 ℃. It is found that the growth mechanism of the FeSeTe films deposited at different Ts is determined by the competition between crystallization and volatilization, and the Ts can serve as an effective means to regulate the (Se+Te): Fe ratio of the FeSeTe films.The superconductivity of the FeSeTe films is co-modulated by the crystallinity and composition. In addition, the Ts can greatly affect the pinning mechanism of the FeSeTe films by introducing the fine nonstoichiometric particles, local chemical inhomogeneity and planar defects. This work facilitates the further performance improvement and practical applications of FeSeTe superconducting films, and is of reference for the FeSeTe film prepared by other deposition methods.

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Section: Resultsmentioning

confidence: 59%

Section: Introductionmentioning

confidence: 99%

Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique

Zhang,

He,

et al. 2024

Supercond. Sci. Technol.

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“…Annealing at high temperatures increases the homogenisation of the substrate surface by enabling the reorganisation of the surface atoms, which in turn enhances the stoichiometry control, texture and nanostrain. 53 3.3.4. Orientation.…”

Section: Substratementioning

confidence: 99%

A practical guide to pulsed laser deposition

et al. 2023

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“…As for examples, using iron buffers layer between MgO substrates and FeSe films remarkably enhanced the atomic stoichiometry and controlled the nanostrain in the films. [ 5 ] In another work coating iron selenide thin films onto SrTiO 3 , LiF, and CaF 2 substrates resulted in a shift in the superconducting transition temperatures from 5.4 to 10.91, and 11.44 K, respectively. [ 6 ] In addition coating of iron selenide onto Nb substrates enhanced its superconductivity and make it suitable as superconducting radio‐frequency cavities that are usually used in accelerators.…”

Section: Introductionmentioning

confidence: 99%

Pb/FeSe Interfaces Designed for Optical Communication Technology

Alharbi,

Qasrawi,

Algarni

2023

Cryst. Res. Technol.

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Herein, thin films of FeSe are coated onto glass and semitransparent Pb substrate of thicknesses of 200 nm. The produced glass/FeSe (GFS) and Pb/FeSe (PFS) are structurally, compositionally, and optically characterized. It is observed that Pb substrates induced the crystallinity of cubic FeSe and cubic PbSe. On average, 21% of the phases in FeSe films are identified as PbSe. Due to the strong orbital overlapping between Pb and FeSe, Pb substrate increases the light absorption, the dielectric constant, the optical conductivity, and the terahertz cutoff frequency by ≈150 %, 180 %, 263 %, and 101 %, respectively. In addition the direct and indirect energy bandgaps shrink from 2.49 and 2.80 to 2.41 and 2.50 eV, respectively. Moreover, treating GFS and PFS as terahertz optical resonators have shown that Pb substrates enhanced the drift mobility and increased the plasmon frequency making it adequate for 6G technology applications. An important feature of the PFS optical resonator is the stability of the terahertz cutoff frequency at 16 THz in the visible range of light. This feature together with the enhanced optical absorption in the visible light region makes the PFS films attractive for visible light communication technology.

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Chemical Composition Control at the Substrate Interface as the Key for FeSe Thin-Film Growth

Cited by 7 publications

References 38 publications

Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique

Unveiling the growth mechanism of FeSeTe films by pulsed laser deposition technique

A practical guide to pulsed laser deposition

Pb/FeSe Interfaces Designed for Optical Communication Technology

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