Proton Irradiation Effects on Granular High-TC Superconductors: Gd1-xPrxBa2Cu3O7-?

Daadmehr, V.; Akhavan, M.

doi:10.1002/1521-396x(200209)193:1<153::aid-pssa153>3.0.co;2-t

Cited by 12 publications

(5 citation statements)

References 46 publications

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“…For each x, the flux pinning energy decreases with the increase of applied magnetic field. This is in agreement with the reports for epitaxial Y-123 thin films [29], single crystals of Bi 2.2 Sr 2 Ca 0.8 Cu 2 O 8+δ [3], polycrystalline YPr-123 [30], and GdPr-123 [31] and Y-123/Pr-123 superlattices [32]. The deduced value of the [34].…”

Section: Resultssupporting

confidence: 92%

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Akhavan¹

2003

Supercond. Sci. Technol.

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The magnetoresistance of single-phase polycrystalline Gd(Ba 2−x Pr x )Cu 3 O 7+δ samples has been studied within the thermally activated flux creep model. The decrease of pinning energy with applied magnetic field can be scaled to two power-law relations for magnetic fields, smaller and also larger than about 1 kOe. The derived H c2 (T), H c2 (0), and superconducting coherence length ξ show that the Pr doping, similar to weak links, decreases the vortex flux pinning energy. It is also concluded that the substitution of Pr at the Ba site has a more destructive effect on the flux dynamics than Pr at the rare-earth site.

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Section: Resultssupporting

confidence: 92%

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Akhavan¹

2003

Supercond. Sci. Technol.

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“…The decrease of pinning energy in the Nd123 system suggests that Pr substitution at Ba sites affects properties, such as weak links, and causes the vortices to creep more easily. This is in agreement with the effect of Pr in Gd(BaPr)123, 52) GdPr123, 53) and Tm(BaPr)123. 54) To fit the ðH; TÞ data within the largest temperature range, we used the AH phase-slip model.…”

Section: Resultssupporting

confidence: 89%

Effect of Pr Doping on Transport Properties of Nd(Ba_2-xPr_x)Cu₃O_7+δ

Maleki¹,

Akhavan²

2005

jjap

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Solid-state-reacted polycrystalline Nd(Ba2-xPrx)Cu3O7+δ materials have been prepared and investigated using X-ray diffraction and resistivity measurements. Our results show that Nd(Ba2-xPrx)Cu3O7+δ is a superconductor when x<0.3. The Tc depression in superconductivity of Pr at Ba sites is due to both hole filling/localization and depairing effects. The normal state conductivity undergoes a dimensional crossover from two-dimensional to three-dimensional in the frame of the variable range hopping regime. The localization length of carriers shows that Pr doping localizes carriers in the normal state and causes the Tc depression. The magnetoresistance of the samples has been investigated within the thermally activated flux creep (TAFC) and Ambegaokar and Halperin (AH) phase slip models. The pinning energy and critical current density decrease with the applied magnetic field and Pr doping. A scaling relation as a power-law dependence of pinning energy on the magnetic field has been obtained. The derived pinning energy shows that Pr doping plays the role of a weak link.

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“…The results of both systems for each x show that the flux pinning energy decreases with increasing applied magnetic field. This is in agreement with the reports for epitaxial Y-123 thin films, 39) single crystals of Bi 2:2 Sr 2 Ca 0:8 Cu 2 O 8þ , 30) GdPr-123 26) and Gd(BaPr)-123. 24) In order to obtain the magnetic field-dependence of the activation energy U 0 ðHÞ, we have fitted a power-law relation for U 0 vs H as U 0 $ H À for each sample.…”

Section: Resultssupporting

confidence: 93%

“…As we expect, the values of pinning energy for Lu-based samples is less than for Tm-based samples. The obtained values for U in Tm-and Lu-based systems and in other similar compounds like Gd(BaPr)-123, 24) Gd(BaLa)-123, 25) and GdPr-123 26) have the same order of magnitude, although the effect of Pr doping on the pinning energy in our samples is less than in Gd(BaPr)-123. 24) Our results are also consistent with the results for YPr-123 27,28) and Bi 1:75 Pb 0:35 Sr 2 Ca 2 Cu 3 -O 10þ .…”

Section: Resultssupporting

confidence: 56%

Flux Dynamics in Ln(Ba_2-xPr_x)Cu₃O_7+δ (Ln=Tm, Lu)

Mokhtari¹,

Akhavan²

2006

jjap

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Single-phase Tm(Ba2-xPrx)Cu3O7+δ and Lu(Ba2-xPrx)Cu3O7+δ compounds with Pr content 0.0≤x≤1.0 have been prepared by solid-state reaction technique. The oxygen content of our samples is more than 7. X-ray diffraction (XRD) patterns demonstrate an orthorhombic to tetragonal transition with an increase in Pr content in both systems. For each system, a solubility limit exists for substitution of Pr at the Ba site. The intergrain region investigated by the thermally activated flux creep (TAFC) and Ambegaokar–Halperin (AH) models, show that the pinning energy decreases with increasing Pr content; it also decreases in each sample with increasing magnetic field as a power-law relation. The temperature and magnetic field dependences of pinning energy in Lu(BaPr)-123 are less than in Tm(BaPr)-123. The intergrain Jc obtained from I–V curves decreases with increasing Pr content and decreases with increasing magnetic field as a power-law relation. Also, the intragrain Jc obtained from the M–H curves, decreases with increasing magnetic field. In both Tm- and Lu-based samples, intragrain Jc is approximately three orders of magnitude larger than intergrain Jc.

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Proton Irradiation Effects on Granular High-TC Superconductors: Gd1-xPrxBa2Cu3O7-?

Cited by 12 publications

References 46 publications

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Effect of Pr Doping on Transport Properties of Nd(Ba_2-xPr_x)Cu₃O_7+δ

Flux Dynamics in Ln(Ba_2-xPr_x)Cu₃O_7+δ (Ln=Tm, Lu)

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Proton Irradiation Effects on Granular High-TC Superconductors: Gd1-xPrxBa2Cu3O7-?

Cited by 12 publications

References 46 publications

Thermally activated flux creep in the Gd(Ba2 xPrx)Cu3O7 system

Thermally activated flux creep in the Gd(Ba2 xPrx)Cu3O7 system

Effect of Pr Doping on Transport Properties of Nd(Ba2-xPrx)Cu3O7+δ

Flux Dynamics in Ln(Ba2-xPrx)Cu3O7+δ (Ln=Tm, Lu)

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Resources

About

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Thermally activated flux creep in the Gd(Ba_2 xPr_x)Cu₃O₇system

Effect of Pr Doping on Transport Properties of Nd(Ba_2-xPr_x)Cu₃O_7+δ

Flux Dynamics in Ln(Ba_2-xPr_x)Cu₃O_7+δ (Ln=Tm, Lu)