Scaling of the vortex pinning force in Bi2Sr2CaCu2O8+y

Rose, R A; Ota, Smita; Groot, P.A.J. de; Jayaram, B.

doi:10.1016/0921-4534(90)90227-6

Cited by 39 publications

(4 citation statements)

References 20 publications

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“…It can be seen that the fitting curve with p = 2.79 and q = 3.14 catches the main feature of the experimental data. As we know the cuprate hightemperature superconductors are usually satisfied with the relation q > p, e.g., q = 4, p = 2 were obtained for YBCO single crystals 59 , and q = 2, p = 0.5 for BSCCO single crystal 60 . In this sample, b for the maximum value of the pinning force density is near 0.5 which corresponds to the δκ-type pinning 61 , however this kind of pinning requests p = q = 1.…”

Section: Characteristics Of Pinning Force Densitymentioning

confidence: 99%

Magnetization relaxation, critical current density, and vortex dynamics in aBa0.66K0.32BiO3+δsingle crystal

et al. 2015

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We have conducted extensive investigations on the magnetization and its dynamical relaxation on a Ba0.66K0.32BiO 3+δ single crystal. It is found that the magnetization relaxation rate is rather weak compared with that in the cuprate superconductors, indicating a higher collective vortex pinning potential (or activation energy), although the intrinsic pinning potential Uc is weaker. Detailed analysis leads to the following discoveries: (1) A second-peak effect on the magnetization-hysteresis-loop was observed in a very wide temperature region, ranging from 2K to 24K. Its general behavior looks like that in YBa2Cu3O7; (2) Associated with the second peak effect, the magnetization relaxation rate is inversely related to the transient superconducting current density Js revealing a quite general and similar mechanism for the second peak effect in many high temperature superconductors; (3) A detailed analysis based on the collective creep model reveals a large glassy exponent µ and a small intrinsic pinning potential Uc; (4) Investigation on the volume pinning force density shows that the data can be scaled to the formula Fp ∝ b p (1 − b) q with p = 2.79 and q = 3.14, here b is the reduced magnetic field to the irreversible magnetic field. The maximum normalized pinning force density appears near b ≈ 0.47. Finally, a vortex phase diagram is drawn for showing the phase transitions or crossovers between different vortex phases. PACS numbers: 74.70.-b, 74.25.Ha, 74.25.Wx, 74.25.Uv U (J s , T, B e ) = U c (T, B e ) µ(T, B e ) [( J c (T, B e ) J s (T, B e ) ) µ(T,Be) − 1] (2)

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Section: Characteristics Of Pinning Force Densitymentioning

confidence: 99%

Magnetization relaxation, critical current density, and vortex dynamics in aBa0.66K0.32BiO3+δsingle crystal

et al. 2015

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“…The use of irreversibility field H irr instead of H c2 for finding the reduced temperature has also been reported for high-T c superconductors. [78][79][80][81][82][83][84][85][86] To plot our universal F p vs h curve we proceed differently. In the F p vs H plots at various temperatures we observe a peak corresponding to the maximum pinning force.…”

Section: B Secondary Experimental Resultsmentioning

confidence: 99%

Effect of extremely fine Y2BaCuO5 precipitates on the critical current density of melt-processed YBa2Cu3Ox

Sengupta

Shi

Luo

et al. 1997

Journal of Applied Physics

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Based on previously developed melt processing methods, Y2BaCuO5 (211) precipitates with various size were obtained in YBa2Cu3Ox (123). In particular, a wide distribution of 211 size from 100 Å to 10 μm has been found to exist in the matrix of 123, and strongly effected the critical current density, Jc. An enhancement of Jc was always found to be associated with the presence of extremely fine 211 precipitates. The flux pinning by these precipitates can be understood by considering the interaction of flux lines with cavities. It was found that although the flux lines are strongly pinned by cavities, the effectiveness decreases with the increasing number of flux lines trapped by them.

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“…Near Tc, the resistive transition corresponds to the "flux flow" dissipative regime [6,7] where the Lorentz force dominates [1]. Thermal dissipation is possible also when the pinning force dominates and is caused by "flux creep" [8] which is more evident in magnetic measurements [4,5]. On the other hand, doping by cation has been intensively studied in order to understand the mechanism of high Tc superconductivity and to improve the properties of the material.…”

Section: Introductionmentioning

confidence: 99%

“…This parameter, which limits the transport of current carried by the material, is controlled by the capability of pinning vortices under applied magnetic field. This is why activation energy, or pinning potential, was studied earlier in Bi based high Tc superconducting materials (HTSC) in both single crystals [1][2][3] and polycrystalline [4,5] samples. The pinning force balances the Lorentz force.…”

Section: Introductionmentioning

confidence: 99%

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

Menassel

Mosbah

Boudjadja

et al. 2016

Materials Science-Poland

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In high Tc superconductors (HTSC) the activation energy gives information about the pinning properties of a sample under applied magnetic field. Pinning of vortices determines the critical current density Jc which is of great importance for practical applications of HTSC. Instead of magnetic measurements, the activation energy may be calculated from resistivity measurements realized under magnetic field. This kind of measurement has been made in this work for yttrium doped samples of Bi 2 Sr 2 CaCu 2 O 8 + d (Bi-2212) for different values of applied magnetic field. Samples of Bi 2 Sr 2 Ca 1 − x Y x Cu 2 O 8 + d (x = 0, 0.025, 0.1, 0.25) were prepared by a sol-gel method and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive analysis of X-ray. The measurements of resistivity were made using a classical four probe method and DC current. The magnetic field was applied with a constant amplitude of 0 T, 1 T, 2 T and 3 T. The obtained results show that the activation energy decreases with introduction of yttrium, but has a relative maximum when x is equal 0.1. The decrease of the activation energy is explained by the granular nature of the samples which promotes 3D transition to 2D of the vortex lattice.

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Scaling of the vortex pinning force in Bi2Sr2CaCu2O8+y

Cited by 39 publications

References 20 publications

Magnetization relaxation, critical current density, and vortex dynamics in aBa0.66K0.32BiO3+δsingle crystal

Magnetization relaxation, critical current density, and vortex dynamics in aBa0.66K0.32BiO3+δsingle crystal

Effect of extremely fine Y2BaCuO5 precipitates on the critical current density of melt-processed YBa2Cu3Ox

Effect Y substitution on the microstructure, transport and magnetic proprieties of Bi2Sr2Ca1Cu2O8+δ superconducting ceramics

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