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- Title
- High-field transport properties of a P-doped BaFeAs film on technical substrate.
- Creator
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Iida, Kazumasa, Sato, Hikaru, Tarantini, Chiara, Hänisch, Jens, Jaroszynski, Jan, Hiramatsu, Hidenori, Holzapfel, Bernhard, Hosono, Hideo
- Abstract/Description
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High temperature (high-T) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-T NbSn due probably to cost and processing issues. The recent discovery of a second class of high-T materials, Fe-based superconductors, may provide another option for high-field-magnet wires. In particular, AEFeAs (AE: Alkali earth elements, AE-122) is one...
Show moreHigh temperature (high-T) superconductors like cuprates have superior critical current properties in magnetic fields over other superconductors. However, superconducting wires for high-field-magnet applications are still dominated by low-T NbSn due probably to cost and processing issues. The recent discovery of a second class of high-T materials, Fe-based superconductors, may provide another option for high-field-magnet wires. In particular, AEFeAs (AE: Alkali earth elements, AE-122) is one of the best candidates for high-field-magnet applications because of its high upper critical field, H, moderate H anisotropy, and intermediate T. Here we report on in-field transport properties of P-doped BaFeAs (Ba-122) thin films grown on technical substrates by pulsed laser deposition. The P-doped Ba-122 coated conductor exceeds a transport J of 10 A/cm at 15 T for main crystallographic directions of the applied field, which is favourable for practical applications. Our P-doped Ba-122 coated conductors show a superior in-field J over MgB and NbTi, and a comparable level to NbSn above 20 T. By analysing the E - J curves for determining J, a non-Ohmic linear differential signature is observed at low field due to flux flow along the grain boundaries. However, grain boundaries work as flux pinning centres as demonstrated by the pinning force analysis.
Show less - Date Issued
- 2017-01-12
- Identifier
- FSU_pmch_28079117, 10.1038/srep39951, PMC5227693, 28079117, 28079117, srep39951
- Format
- Citation
- Title
- A route for a strong increase of critical current in nanostrained iron-based superconductors.
- Creator
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Ozaki, Toshinori, Wu, Lijun, Zhang, Cheng, Jaroszynski, Jan, Si, Weidong, Zhou, Juan, Zhu, Yimei, Li, Qiang
- Abstract/Description
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The critical temperature T and the critical current density J determine the limits to large-scale superconductor applications. Superconductivity emerges at T. The practical current-carrying capability, measured by J, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T. Simultaneous increase of T and J in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both T and J together in iron-based...
Show moreThe critical temperature T and the critical current density J determine the limits to large-scale superconductor applications. Superconductivity emerges at T. The practical current-carrying capability, measured by J, is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T. Simultaneous increase of T and J in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both T and J together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSeTe films. T is enhanced due to the nanoscale compressive strain and proximity effect, whereas J is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of J enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.
Show less - Date Issued
- 2016-10-06
- Identifier
- FSU_pmch_27708268, 10.1038/ncomms13036, PMC5059717, 27708268, 27708268, ncomms13036
- Format
- Citation
- Title
- A route for a strong increase of critical current in nanostrained iron-based superconductors.
- Creator
-
Ozaki, Toshinori, Wu, Lijun, Zhang, Cheng, Jaroszynski, Jan, Si, Weidong, Zhou, Juan, Zhu, Yimei, Li, Qiang
- Abstract/Description
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The critical temperature T-c and the critical current density J(c) determine the limits to large-scale superconductor applications. Superconductivity emerges at T-c. The practical current-carrying capability, measured by J(c), is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T-c. Simultaneous increase of T-c and J(c) in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both T-c and J(c) together in...
Show moreThe critical temperature T-c and the critical current density J(c) determine the limits to large-scale superconductor applications. Superconductivity emerges at T-c. The practical current-carrying capability, measured by J(c), is the ability of defects in superconductors to pin the magnetic vortices, and that may reduce T-c. Simultaneous increase of T-c and J(c) in superconductors is desirable but very difficult to realize. Here we demonstrate a route to raise both T-c and J(c) together in iron-based superconductors. By using low-energy proton irradiation, we create cascade defects in FeSe0.5Te0.5 films. T-c is enhanced due to the nanoscale compressive strain and proximity effect, whereas J(c) is doubled under zero field at 4.2 K through strong vortex pinning by the cascade defects and surrounding nanoscale strain. At 12 K and above 15 T, one order of magnitude of J(c) enhancement is achieved in both parallel and perpendicular magnetic fields to the film surface.
Show less - Date Issued
- 2016-10-06
- Identifier
- FSU_libsubv1_wos_000385556300001, 10.1038/ncomms13036
- Format
- Citation
