Enhanced JC in air-processed GdBa2Cu3O7−δ superconductor bulk grown by the additions of nano-particles

Zhang, Y. F.; Izumi, Mitsuru; Li, Y.; Murakami, Masato; Gao, Tian; Liu, Y. S.; Li, P. L.

doi:10.1016/j.physc.2011.05.069

Cited by 19 publications

(11 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The ac magnetic susceptibility at different applied dc fields was measured using a Quantum Design Physical Properties Measurements System (PPMS) equipped with a Table 1 The values of T c and n 1 of the power relation obtained from (1) at low field (H < 1000 Oe), n 2 of the power relation obtained from (1) at high field (H > 1000 Oe), and the fitting parameters (K, m, and γ ) according to (2) 9-T superconducting magnet. The system has a sensitivity of 1 × 10 −8 emu, an amplitude range of 0.005-15 Oe (peak), and a frequency range of 10 Hz-10 KHz, with a direct phase-nulling technique that measures and cancels background ac phase shifts at every measurement.…”

Section: Experimental Techniquesmentioning

confidence: 99%

“…The experimental result with the fitting according to (2) for (CoFe 2 O 4 ) x GdBa 2 Cu 3 O 7−δ compounds with x = 0, 0.02, 0.04, 0.08, and 0.1 wt% and the fitted data are shown in Fig. 7.…”

Section: Temperature (K)mentioning

confidence: 99%

“…It possess high superconducting transition temperature (around 90 K) [1], high critical current density J c values at high magnetic fields [2,3], high ability to trap the magnetic field up to 2.0 T at 77 K [4], relative low crystalline anisotropy, and well-developed pinning properties in the magnetic field [5]. However, Gd-123 showed a rapid decrease in its critical current density as both the temperature and the magnetic field increase.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

Basma

Awad

Roumié³

et al. 2015

J Supercond Nov Magn

View full text Add to dashboard Cite

CoFe 2 O 4 ) x GdBa 2 Cu 3 O 7−δ superconducting samples were synthesized using a conventional solid-state reaction technique with 0 ≤ x ≤ 0.1 wt%. Characterization of the prepared samples was carried out using X-ray powder diffraction (XRD) and scanning electron microscopy (SEM). The effect of adding CoFe 2 O 4 to the Gd-123 phase, which acts as a flux pinning center, was investigated by measuring the ac magnetic susceptibility at different applied dc magnetic fields. Both the superconducting transition temperature T c and the critical current density J c increased up to x = 0.01 wt%, and then, they decreased with further increase in x. The temperature dependence of the irreversibility line was investigated by the logarithmic plot of the irreversibility field H irr versus (1 − T irr /T c (0)). This plot shows a crossover at a field of 1000 Oe, indicating 3D to 2D flux creep fluctuations. Furthermore, the H irr -T curves are well fitted according to a theoretical model proposed by Matsushita, based on the depinning mechanism caused by thermally activated flux creep.

show abstract

Section: Experimental Techniquesmentioning

confidence: 99%

Section: Temperature (K)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

Basma

Awad

Roumié³

et al. 2015

J Supercond Nov Magn

View full text Add to dashboard Cite

show abstract

“…The addition of nanoparticles into the bulk superconductors is an effective method to increase the pinning forces and thus to enhance the critical current density c J [3][4][5][6][7]. Moreover, the addition of some magnetic particles  such as Fe-B alloy particles [8] and α-Fe 2 O 3 [9] into the Gd-123 bulk superconductor enhances c J under the self-field.…”

Section: Introductionmentioning

confidence: 99%

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

et al. 2016

View full text Add to dashboard Cite

Superconductor samples of type (CoFe 2 O 4 ) x GdBa 2 Cu 3 O 7δ (0≤x≤0.1) were synthesized by the conventional solid-state reaction technique, whereas nanosized CoFe 2 O 4 was prepared by co-precipitation method with grain size of about 8.5 nm. The elemental content of the prepared samples was determined using particle induced X-ray emission (PIXE). The temperature dependence of real (  ) and imaginary (  ) components of AC magnetic susceptibility (ACMS) at different magnetic field amplitude (3-15 Oe) was investigated. The analysis of the temperature dependence of ACMS was performed using Bean critical state model. The values of the critical current density c J at T > p T ( p T is the inter-granular loss peak temperature) were calculated as a function of magnetic field and nanosized CoFe 2 O 4 content. It was found that the low nanosized CoFe 2 O 4 addition content (x = 0.01) improves the critical current density c J of Gd-123 superconducting phase. The observed variation of c J with temperature indicated that the weak links are changed from superconductornormal metal-superconductor (SNS) for free sample to superconductor-insulator-superconductor (SIS) type of junctions for samples added with nanosized CoFe 2 O 4 of x > 0.01. We also discussed the experimental results in the framework of the critical state model to estimate the effective volume fraction of the grains g f using Cole-Cole plots.

show abstract

“…Gd-123 is regarded as a promising material in the field of high temperature superconductors HTSCs. It possesses high superconducting transition temperature (around 90 K) [1], high critical current density values at high magnetic fields [2] [3], high ability to trap the magnetic field up to 2.0 T at 77 K [4], relative low crystalline anisotropy and well developed pinning properties in the magnetic field [5]. However, Gd-123 showed a rapid decrease in its J c due to the movement of the non-superconducting vortices, as both the temperature and the magnetic field increase.…”

Section: Introductionmentioning

confidence: 99%

Ion Beam Analysis and Electric Properties of GdBa2Cu3O7-δ Added with Nanosized Ferrites ZnFe2O4 and CoFe2O4

Basma¹,

Roumié²,

Awad³

et al. 2015

MSA

View full text Add to dashboard Cite

In this study, superconducting samples of type GdBa2Cu3O7−δ added with x wt% (0 ≤ x ≤ 0.4) nanoferrites ZnFe2O4 and CoFe2O4 were prepared by the conventional solid-state reaction technique. The prepared samples were characterized using X-ray powder diffraction (XRD) in order to determine the volume fraction and lattice parameters. The elemental contents of the prepared samples were determined using particle induced X-ray emission (PIXE). In addition, the oxygen-content of these samples was obtained using non-Rutherford backscattering spectroscopy (RBS) at 3 MeV proton beam. It is found that the Oxygen-content of GdBa2Cu3O7−δ phase remains practically constant for low additions of both nanoferrites but it increases with high additions. The electrical resistivity of the prepared samples was measured by the conventional four-probe technique from room temperature down to the zero superconducting transition temperature (T0). An increase in the superconducting transition temperature Tc and the critical current density Jc is observed as x varies from 0.0 to 0.06 wt% of (ZnFe2O4)xGdBa2Cu3O7−δ, followed by a systematic decrease with increasing x. On the other hand, the Tc values for (CoFe2O4)xGdBa2Cu3O7−δ show a systematic decrease with x for both high and low additions while Jc is enhanced up to x = 0.01 wt% and decrease with further increase in x.

show abstract

Enhanced JC in air-processed GdBa2Cu3O7−δ superconductor bulk grown by the additions of nano-particles

Cited by 19 publications

References 21 publications

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

Ion Beam Analysis and Electric Properties of GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> Added with Nanosized Ferrites ZnFe<SUB>2</SUB>O<SUB>4</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB>

Contact Info

Product

Resources

About

Enhanced JC in air-processed GdBa2Cu3O7−δ superconductor bulk grown by the additions of nano-particles

Cited by 19 publications

References 21 publications

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

Study of the Irreversibility Line of GdBa 2Cu 3 O 7 − δ Added with Nanosized Ferrite CoFe 2 O 4

The effect of nanosized CoFe2O4 addition on the magnetic properties of GdBa2Cu3O7-δ using AC magnetic susceptibility measurements

Ion Beam Analysis and Electric Properties of GdBa&lt;SUB&gt;2&lt;/SUB&gt;Cu&lt;SUB&gt;3&lt;/SUB&gt;O&lt;SUB&gt;7-δ&lt;/SUB&gt; Added with Nanosized Ferrites ZnFe&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;4&lt;/SUB&gt; and CoFe&lt;SUB&gt;2&lt;/SUB&gt;O&lt;SUB&gt;4&lt;/SUB&gt;

Contact Info

Product

Resources

About

Ion Beam Analysis and Electric Properties of GdBa<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB> Added with Nanosized Ferrites ZnFe<SUB>2</SUB>O<SUB>4</SUB> and CoFe<SUB>2</SUB>O<SUB>4</SUB>