ZFC, FC and REM susceptibility of granular superconductors

Smolyak, B. M.; Postrekhin, E.V.; Ermakov, G. V.

doi:10.1088/0953-2048/7/6/016

Cited by 6 publications

(7 citation statements)

References 17 publications

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“…Therefore we can say that the magnetic properties of the samples are similar when the connections between 1051-8223/03$17.00 © 2003 IEEE the grains have been destroyed. The difference between the ZFC and the FC curve is due to flux trapped inside the particles [4]. In 0.5 mT some of the weak links are still superconducting and contribute to the susceptibility.…”

Section: Resultsmentioning

confidence: 98%

Weak links in YBCO nanopowder

Paturi

Raittila

Huhtinen

2003

IEEE Trans. Appl. Supercond.

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We have prepared YBCO nanopowder by the sol-gel route. The original powder contains weak links as observed by magnetization and microwave absorption measurements. Most of the weak links could be reduced by keeping the powder in ethanol for 30 min in an ultrasonic bath. It was also found that the ultrasonic bath does not affect the superconducting properties of the nanoparticles themselves. The modulation field applied in the microwave absorption measurements was found to have a large effect on the temperature dependence of the absorption. This phenomenon was explained with a phase diagram for the weak links.

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Section: Resultsmentioning

confidence: 98%

Weak links in YBCO nanopowder

Paturi

Raittila

Huhtinen

2003

IEEE Trans. Appl. Supercond.

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“…The planetary ball milled and hand grinded samples were shaped by cold‐pressed sintering at 30 MPa and then sintered at 920 °C for 20 h. As shown in the inset of Figure 4a and Figure S14, Supporting Information, the superconductivities of the 3D‐printed, planetary ball milling, and hand grinding samples sharply decayed with a T c of 91, 92, and 92 K, respectively. [ 32 ] The T c of the 3D‐printed YBCO (91 K) was slightly lower than that of the cold‐pressed sintering samples (92 K). The superconductivity of the 3D‐printed sample did not decrease because the thermal treatment in an oxygen environment completely eliminated the binder.…”

Section: Resultsmentioning

confidence: 99%

Efficient Fabrication of Ultralight YBa₂Cu₃O₇₋_x Superconductors with Programmable Shape and Structure

Zhang

et al. 2021

Adv Funct Materials

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Superconducting YBa 2 Cu 3 O 7−x (YBCO) bulks have demonstrated promising applications in quasi-permanent magnets, levitation, etc. Recently, the applications of bulk superconductors have been proposed, such as in portable, ultralight superconducting devices. These applications require bulk superconductors with lightweight, complex morphology, and good processability. However, the traditional fabrication method of YBCO bulks requires prolonged supplemental oxygenation and produces limited geometries with many randomly distributed cracks. This, combined with the inherent brittleness of the ceramic material, seriously impedes its wide application. In this study, a YBCO bulk with a multiscale hierarchical geometric configuration is constructed by a direct-inkwriting-based 3D-printing process. The 3D-printed YBCO green bodies exhibit a robust structure after directional freezing, which promotes intimate contact between the precursor particles in the deposited layers. This technology offers the advantage of a low shrinkage of 13.6 vol% after sintering at 920 °C. The 3D-printed bulks show lightweight, highly crystalline, and good electromagnetic properties compared with those produced by traditional cold-pressed sintering. Importantly, the multilevel void structure with a large specific surface area significantly reduces the oxygenation time and retains superconductivity. The proposed 3D-printing process can be adopted for the industrial production of superconducting bulk with complex geometries for novel applications.

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“…These pellets were held perpendicular to the applied field during measurements. [34][35][36][37][38] Here, ΔM (in emu/cm 3 ) is the width of the hysteresis curves shown in Fig. 5(a, b, c).…”

Section: Resultsmentioning

confidence: 99%

Suppression of Superconductivity by Anharmonic Oscillations in Zn- or Ni-doped Cu0.5Tl0.5Ba2(CaMg)Cu1.5M1.5O10-δ (M=Zn, Ni) Superconductors; Evident by Magnetic Measurements

Safeer

Raza

Khan

et al. 2021

J. Electron. Mater.

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An inter-comparison of the superconducting properties of Cu 0.5 Tl 0.5 Ba 2 (CaMg)Cu 3 O 10-δ and Cu 0.5 Tl 0.5 Ba 2 (CaMg) Cu 1.5 M 1.5 O 10-δ (M = Zn, Ni)-doped samples was undertaken. Our main objective was to determine the role of electron-phonon interactions in the mechanism of high-temperature superconductivity in these oxide superconductors. We achieved this goal indirectly by doping Zn and Ni at the Cu sites in this compound. The replacement of Cu with Zn/Ni atoms induced anharmonic oscillations due to the difference in their masses. The influence of anharmonic oscillations was enhanced due to the decreased distance between the conducting CuO 2 /MO 2 (M = Zn, Ni) planes. A comparison of zero-field-cooled (ZFC) and field-cooled (FC) magnetic moments showed suppression in the magnitude of diamagnetism with doping of Zn and Ni atoms. We suggest that the suppression in the magnetic moments arises from the difference in the atomic mass of the doped atoms in comparison with Cu atoms. With doping of Zn and Ni, the width of the magnetic hysteresis loops and their critical current density are suppresses. These decreased values in the doped samples give rise to huge anharmonic oscillations that suppress the population of phonons necessary for the mechanism of electron-phonon interactions Keywords Cu 0.5 Tl 0.5 Ba 2 (CaMg)Cu 1.5 M 1.5 O 10-δ (M=Zn, Ni) samples • infield magnetic measurements • anharmonic oscillations • electron-phonon interactions • high-temperature superconductors * Syed Hamza Safeer

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ZFC, FC and REM susceptibility of granular superconductors

Cited by 6 publications

References 17 publications

Weak links in YBCO nanopowder

Weak links in YBCO nanopowder

Efficient Fabrication of Ultralight YBa₂Cu₃O₇₋_x Superconductors with Programmable Shape and Structure

Suppression of Superconductivity by Anharmonic Oscillations in Zn- or Ni-doped Cu0.5Tl0.5Ba2(CaMg)Cu1.5M1.5O10-δ (M=Zn, Ni) Superconductors; Evident by Magnetic Measurements

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ZFC, FC and REM susceptibility of granular superconductors

Cited by 6 publications

References 17 publications

Weak links in YBCO nanopowder

Weak links in YBCO nanopowder

Efficient Fabrication of Ultralight YBa2Cu3O7−x Superconductors with Programmable Shape and Structure

Suppression of Superconductivity by Anharmonic Oscillations in Zn- or Ni-doped Cu0.5Tl0.5Ba2(CaMg)Cu1.5M1.5O10-δ (M=Zn, Ni) Superconductors; Evident by Magnetic Measurements

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Efficient Fabrication of Ultralight YBa₂Cu₃O₇₋_x Superconductors with Programmable Shape and Structure