Overcoming optimization constraint for J
 c by hybrid pinning in YBa2Cu3O7 films containing nanorods

Horide, Tomoya; Torigoe, Kenta; Kita, R.; Awaji, Satoshi; Matsumoto, Kaname

doi:10.35848/1347-4065/abdc32

Cited by 3 publications

(3 citation statements)

References 28 publications

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“…According to the STEM image of the YBCO+BLuNO(5) film, it is expected that the nanoparticle spacing along the c-axis is too low in the BLuNO(10) film. A too large Y 2 O 3 content has decreased J c in the hybrid pinning of the YBCO+BHO +Y 2 O 3 , 44 and in this study, a too large BLuNO content (15%) decreased the J c . It is suggested that the Y 2 O 3 nano-inclusions worked as correlated pinning centers rather than random pinning centers due to their distribution.…”

Section: Resultssupporting

confidence: 62%

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Horide

Yoshida

Kita

et al. 2022

ACS Appl. Electron. Mater.

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To fabricate high performance YBa 2 Cu 3 O 7 superconducting films and tapes, the critical current density (J c ) should be enhanced and the nanocomposite structure should be very effective in controlling the vortex pinning and J c . Although the nanoscale morphology has been a basic parameter from the early stages of nanorod control, compositional factors should be discussed to effectively control not only the superconducting order parameter distribution but also the thermodynamic parameter relating to crystal growth. In this study, a double perovskite oxide, Ba 2 RENbO 6 (RE = Yb, Lu), was incorporated in YBa 2 Cu 3 O 7 films, where the site occupancy of the RE element is focused to control the nanocomposite structure. The elongated nanorods were formed in both the YBa 2 Cu 3 O 7 +Ba 2 YbNbO 6 and YBa 2 Cu 3 O 7 +Ba 2 LuNbO 6 films. While Lu mainly existed in the nanorods, Yb was observed not only in the nanorods but also in the matrix. As a result, at the fixed nanorod content, while the matching field was larger for the YBa 2 Cu 3 O 7 +Ba 2 YbNbO 6 film, the J c in the high magnetic field was larger for the YBa 2 Cu 3 O 7 +Ba 2 LuNbO 6 film. The angular dependence of J c depended on the RE due to the pinning contribution from the Y-rich nanoparticles. These are unconventional phenomena that are not observed in the YBa 2 Cu 3 O 7 +BaMO 3 (M = Zr, Sn, Hf) films. Thus, the site occupancy of the RE element affects the J c characteristics. The selforganization and the nanocomposite structure can be designed by considering the site occupancy as a variable parameter.

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Section: Resultssupporting

confidence: 62%

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Horide

Yoshida

Kita

et al. 2022

ACS Appl. Electron. Mater.

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“…Here, detailed comparison of BHO (2 Hz) and BHO (10 Hz) is made here. Figure 8 shows magnetic field dependence of F p for the BHO (10 Hz) and BHO (2 Hz) at temperatures of 20 K, 40 K, and 65 K. Each result has been partially reported previously [31,32]. An F p peak was observed at almost the same magnetic field, showing that comparison at almost the same matching field is possible in figure 8.…”

Section: Superconducting Propertysupporting

confidence: 75%

“…Specification of sample. Some results of the films have been partially reported in our previous paper[31,32]. The matching field was determined by the shoulder of T irr -B curve.…”

mentioning

confidence: 95%

Modulation of vortex pinning by matrix defects in YBa₂Cu₃O₇ nanocomposite film

Horide,

Higashi,

Ishimaru

et al. 2023

Supercond. Sci. Technol.

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Nanorods are a very effective pinning center in YBa2Cu3O7 films, and the vortex pinning mechanism should be understood to further improve the critical current density (J c) in the nanocomposite films. Matrix defects are naturally formed during nanocomposite growth, and in this study the effect of matrix defects on the J c in the YBa2Cu3O7 films containing nanorods is discussed. YBa2Cu3O7 + BaHfO3 and YBa2Cu3O7 + BaSnO3 films were prepared by varying the laser repetition frequency to control the matrix defects. All the films contained the nanorods. The YBa2Cu3O7 + BaHfO3 film of 2 Hz exhibits high J c for magnetic field parallel to the c-axis (B//c) due to the nanorods and the isolated random point defects. In the YBa2Cu3O7 + BaHfO3 film of 10 Hz, while the short stacking faults and networked random point defects decreased the J c for B//c, the short stacking faults improved the J c for tilted magnetic field. In the YBa2Cu3O7 + BaSnO3 film of 10 Hz, the isolated random point defects improved J c regardless of the magnetic field direction. While the ab-plane correlated defects are analyzed by the structural observation, the network or isolated nature of the random point defects can be discussed by the normal state resistivity. The matrix defects of YBa2Cu3O7 nanocomposite films should be designed considering the correlated/network/isolated nature which is determined by the morphology and defect concentration.

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Nano- to microscale structural and compositional heterogeneity of artificial pinning centers in pulsed-laser-deposited YBa2Cu3O7−y thin films

Kuroki

Horide

Matsumoto

et al. 2023

Journal of Applied Physics

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The structure, composition, and spatial distribution heterogeneity of artificial pinning centers affect the critical current density of REBa2Cu3O7−y (RE: rare earth) coated conductors. Nanoscale structures and compositions have been analyzed with transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM). However, microscale heterogeneity has been difficult to characterize. Here, YBa2Cu3O7−y thin films doped with double-perovskite Ba2YbNbO6 were prepared via pulsed-laser deposition and characterized with TEM, STEM, and scanning electron microscopy (SEM). Cross-sectional and plan-view TEM/STEM imaging revealed hybrid pinning structures consisting of nanorods, nanoparticles, and planar defects that were formed spontaneously. Nanorods were imaged with high spatial resolution via field-emission SEM of thin-foil specimens. Focused-ion-beam (FIB) micro-sectioning enables SEM imaging of microscale heterogeneity in nanorod spatial distributions. By using TEM/STEM in conjunction with FIB-SEM, the coated conductor inhomogeneity was directly evaluated from the nano- to micrometer scales.

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Overcoming optimization constraint for J _c by hybrid pinning in YBa₂Cu₃O₇ films containing nanorods

Cited by 3 publications

References 28 publications

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Modulation of vortex pinning by matrix defects in YBa₂Cu₃O₇ nanocomposite film

Nano- to microscale structural and compositional heterogeneity of artificial pinning centers in pulsed-laser-deposited YBa2Cu3O7−y thin films

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Overcoming optimization constraint for J c by hybrid pinning in YBa2Cu3O7 films containing nanorods

Cited by 3 publications

References 28 publications

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa2Cu3O7 Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa2Cu3O7 Superconducting Films

Modulation of vortex pinning by matrix defects in YBa2Cu3O7 nanocomposite film

Nano- to microscale structural and compositional heterogeneity of artificial pinning centers in pulsed-laser-deposited YBa2Cu3O7−y thin films

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Resources

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Overcoming optimization constraint for J _c by hybrid pinning in YBa₂Cu₃O₇ films containing nanorods

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Self-Organized Nanocomposite Structure Controlled by Elemental Site Occupancy to Improve Vortex Pinning in YBa₂Cu₃O₇ Superconducting Films

Modulation of vortex pinning by matrix defects in YBa₂Cu₃O₇ nanocomposite film