Laser fluence dependence of stoichiometry and superconductivity of iron chalcogenide superconducting films on metal tapes

Ye, Jiachao; Mou, Shaojing; Zhu, Rongji; Liu, Linfei; Li, Yijie

doi:10.1063/5.0098216

Cited by 5 publications

(2 citation statements)

References 87 publications

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“…This is caused by the lack of iron in FST films, resulting in a relatively high amount of the semiconductor elements Se and Te. 37,46 A criterion of 10% and 90% of the normal state resistance at 20 K is used to define 𝑇 zero c and 𝑇 onset c , respectively. The difference between 𝑇 zero c and 𝑇 onset c is defined as the transition width Δ𝑇 c .…”

Section: Resultsmentioning

confidence: 99%

“…It is observed that the resistance of all FST films decreases with increasing temperature in the normal state, exhibiting a semiconducting behavior. This is caused by the lack of iron in FST films, resulting in a relatively high amount of the semiconductor elements Se and Te 37,46 . A criterion of 10% and 90% of the normal state resistance at 20 K is used to define

T_{\mathrm{c}}^{{\mathrm{zero}}}

and

T_{\mathrm{c}}^{{\mathrm{onset}}}

, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Performance improvement of iron chalcogenide films grown at high laser repetition rates by pulsed laser deposition

Mou,

Ye,

Zhu

et al. 2023

J Am Ceram Soc.

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For mass production, the high deposition rate is necessary. A powerful approach is to deposit Fe(Se, Te) (FST) superconducting films at high laser repetition rate by pulsed laser deposition. Hence the FST films were grown on flexible metallic tapes using pulsed laser deposition at different laser repetition rates to explore the effect of laser repetition rate on the properties. It was found that as the laser repetition rate increases, the crystallinity and stoichiometry of FST films deteriorate, resulting in a degeneration in superconductivity. The critical temperature of the FST film deposited at a high repetition rate of 120 Hz dropped to 12.89 K. Furthermore, high performance FST film was successfully deposited at 120 Hz by increasing the substrate temperature with = 16.96 K and = 18.32 K. And the self‐field critical current density can reach 1.3 MA/cm2 at 4.2 K. The analysis of the pinning mechanism reveals that normal surface pinning centers play a dominant part in the FST film and are independent of the temperature. The collective pinning theory states that the FST film exhibits l pinning. The results may offer valuable information for rapid deposition of FST coated conductors for industrial production.This article is protected by copyright. All rights reserved

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Section: Resultsmentioning

confidence: 99%

T_{\mathrm{c}}^{{\mathrm{zero}}}

and

T_{\mathrm{c}}^{{\mathrm{onset}}}

, respectively.…”

Section: Resultsmentioning

confidence: 99%

Performance improvement of iron chalcogenide films grown at high laser repetition rates by pulsed laser deposition

Mou,

Ye,

Zhu

et al. 2023

J Am Ceram Soc.

Self Cite

View full text Add to dashboard Cite

show abstract

In-situ laser shock peening for improved surface quality and mechanical properties of laser-directed energy-deposited AlSi10Mg alloy

Zhou

et al. 2022

Additive Manufacturing

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Evolution of superconductivity dependence on substrate temperature with thickness of Fe(Se,Te) coated conductors deposited on metal tapes

Mou

Zhu

et al. 2022

Journal of Applied Physics

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Fe(Se,Te) films of different thicknesses were deposited on metal tapes by pulsed laser deposition at different substrate temperatures. It is found that the substrate temperature dependence of superconductivity changes with the Fe(Se,Te) film thickness. When fabricating thin Fe(Se,Te) films with a thickness of about 150 nm, moderate substrate temperatures are conducive to balancing the influence of texture and stoichiometry on superconductivity, contributing to the obtainment of good superconductivity. When the Fe(Se,Te) films’ thickness is about 300 nm, the optimal substrate temperatures are lowered due to the determination of film superconductivity by the inhomogeneity of longitudinal chalcogen distribution via the cooperation of Te loss in the long-term-ablated target and the attraction of metal ions in the buffer layer. In addition, with a further increase in thickness from 300 to 600 nm, the self-field critical current of thick Fe(Se,Te) films continuously increases, but the critical current density increases first and then decreases, which is thought to be a result of the misoriented grains or non-superconducting phase due to the large deviation between the actual deposition temperature and the set substrate temperature, and the Se excess in the film. In addition, the 450-nm-thick Fe(Se,Te) film exhibits excellent self-field and in-field performances at 4.2 K: 1.308 MA/cm2 at self-field and over 0.5 MA/cm2 at 9 T. Point pinning, which is the local lattice disturbance randomly distributed in the film observed by transmission electron microscopy, dominates over the entire temperature range.

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Laser fluence dependence of stoichiometry and superconductivity of iron chalcogenide superconducting films on metal tapes

Cited by 5 publications

References 87 publications

Performance improvement of iron chalcogenide films grown at high laser repetition rates by pulsed laser deposition

Performance improvement of iron chalcogenide films grown at high laser repetition rates by pulsed laser deposition

In-situ laser shock peening for improved surface quality and mechanical properties of laser-directed energy-deposited AlSi10Mg alloy

Evolution of superconductivity dependence on substrate temperature with thickness of Fe(Se,Te) coated conductors deposited on metal tapes

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