Increase of critical currents and peak effect in Mo-substituted<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi>YBa</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Cu</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:mrow></mml:math>

Rogacki, K.; Dąbrowski, B.; Chmaissem, O.

doi:10.1103/physrevb.73.224518

Cited by 13 publications

(15 citation statements)

References 42 publications

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“…It is possible to confirm that the main pinning mechanism of ScY (h 0 = 0.35  0.02), ScSr002 (h 0 = 0.34  0.02) and ScSr01 (h 0 = 0.34  0.02) samples is the core normal point type (h 0 = 0.33). It is in agreement with other results reported by the literature to YBa 2 Cu 3 O 7- single crystals [1], [8], [17]. Similarly to the ScSr025 (h 0 = 0.42  0.05) and ScSr037 (h 0 = 0.17  0.05) samples, the main pinning mechanism identified is the core ∆k volume type (h 0 = 0.5) to the ScSr025 sample and core normal surface type (h 0 = 0.2) to the ScSr037 sample.…”

Section: Introductionsupporting

confidence: 94%

“…The normalized pinning force density, f = F P /F P,max (where F P,max corresponds to the upper F P (B,T) data) versus the reduced field, h = B/B irr plots is applied as an efficiently tool to identify and distinguish the contribution of the different pinning mechanisms to the behavior of J c (B,T) [1], [6], [8], [14], [15]. Fig.…”

Section: Introductionmentioning

confidence: 99%

“…In the equation (2), A is a numerical parameter, p and q are fitting parameters related to the geometric characteristics of the pinning centers. For the case of HTSC the appropriate scaling field applied in the reduced field h of equation (2) is the B IRR (T) instead B C2 (T), which is specifically used to the case of conventional type II superconductors [1], [6], [8], [14].…”

Section: Introductionmentioning

confidence: 99%

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Chemically Introduced Disorder Effects on the Critical Current Density and Pinning Mechanisms of ${YBa}_{2-x}{Sr}_{x}{Cu}_{3}{O}_{7-\delta}$

Lopes

Vieira

Dias

et al. 2016

IEEE Trans. Appl. Supercond.

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Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista [IEEE transactions on applied superconductivity]. URL d'aquest document a UPCommons E-prints: Abstract-We report on isotherm (T = 77.5 K) DC magnetization hysteresis loops of a series of YBa 2-x Sr x Cu 3 O 7- (x = 0, 0.02, 0.1, 0.25 and 0.37) single crystals with the purpose of studying the influence of chemically introduced site disorder on the YBa 2 Cu 3 O 7- critical current density, J c (B,T) and normalized pinning force density, f(h). The Sr ion chemical disorder is inserted at YBa 2 Cu 3 O 7- structure by lattice distortion. Transmission electronic microscopy (TEM) of the doped samples shows a structure constituted by a high density of twins, probably, decorated by many small precipitates. The J c (B,T) transported by the doped samples with x  0.10 is higher than that transported by the YBa 2 Cu 3 O 7- pure sample. In contrast, the J c (B,T) transported by the doped samples with x > 0.10 is significant and systematically lower than that transported by the undoped sample. The analysis of the f(h) plots indicates, in the light of Dew Hughes model, that the preponderant pinning mechanism of YBa 2-x Sr x Cu 3 O 7- single crystals with x  0.10 is the core normal point type. However to the samples with x > 0.10, the f(h) analyses indicates that the preponderant pinning mechanism undergoes a crossover from the core normal point type to the core normal surface type. This crossover of pinning mechanism dynamics could be appointed as the possible reason of the decrease of the J c (B,T) observed in the samples with x > 0.10.

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Section: Introductionsupporting

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chemically Introduced Disorder Effects on the Critical Current Density and Pinning Mechanisms of ${YBa}_{2-x}{Sr}_{x}{Cu}_{3}{O}_{7-\delta}$

Lopes

Vieira

Dias

et al. 2016

IEEE Trans. Appl. Supercond.

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“…This model and its numerous modifications were successfully used to analyze pinning properties in several high-T c superconductors. 31,32 As a scaling field H* we use H Fp,max (see Fig. D2) and fit the experimental results well for p = q = 1.8 (blue line).…”

Section: Appendix D: Peak Effect Scalingmentioning

confidence: 87%

“…This analysis of pinning bases on the Dew-Hughes 30 model with a modified scaling law f(h) = h p (2-h) q , where f = F p /F p,max , h = H/H*, H* is a scaling field, and p and q depend on the relevant pinning mechanism. This model and its numerous modifications were successfully used to analyze pinning properties in several high-T c superconductors 31,32. As a scaling field H* we use H Fp,max (see Fig.D2) and fit the experimental results well for p = q = 1.8 (blue line).…”

mentioning

confidence: 99%

High magnetic-field scales and critical currents in SmFeAs(O, F) crystals

et al. 2010

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With the discovery of new superconducting materials, such as the iron pnictides, exploring their potential for applications is one of the foremost tasks. Even if the critical temperature T(c) is high, intrinsic electronic properties might render applications difficult, particularly if extreme electronic anisotropy prevents effective pinning of vortices and thus severely limits the critical current density, a problem well known for cuprates. Although many questions concerning microscopic electronic properties of the iron pnictides have been successfully addressed and estimates point to a very high upper critical field, their application potential is less clear. Thus, we focus here on the critical currents, their anisotropy and the onset of electrical dissipation in high magnetic fields up to 65 T. Our detailed study of the transport properties of SmFeAsO(0.7)F(0.25) single crystals reveals a promising combination of high (>2 x 10(6) A cm(-2)) and nearly isotropic critical current densities along all crystal directions. This favourable intragrain current transport in SmFeAs(O, F), which shows the highest T(c) of 54 K at ambient pressure, is a crucial requirement for possible applications. Essential in these experiments are four-probe measurements on focused-ion-beam-cut single crystals with a sub-square-micrometre cross-section, with current along and perpendicular to the crystallographic c axis.

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Contrasting effects of metal oxide dopants on the superconductivity of YBa2Cu3O7-δ ceramics

Ozabaci

2019

J Mater Sci: Mater Electron

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Increase of critical currents and peak effect in Mo-substitutedYBa2Cu3O7

Cited by 13 publications

References 42 publications

Chemically Introduced Disorder Effects on the Critical Current Density and Pinning Mechanisms of ${YBa}_{2-x}{Sr}_{x}{Cu}_{3}{O}_{7-\delta}$

Chemically Introduced Disorder Effects on the Critical Current Density and Pinning Mechanisms of ${YBa}_{2-x}{Sr}_{x}{Cu}_{3}{O}_{7-\delta}$

High magnetic-field scales and critical currents in SmFeAs(O, F) crystals

Contrasting effects of metal oxide dopants on the superconductivity of YBa2Cu3O7-δ ceramics

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