Correlation Between Pressure Dependence of Critical Temperature and the Reversible Strain Effect on the Critical Current and Pinning Force in $\hbox{Bi}_{2}\hbox{Sr}_{2} \hbox{CaCu}_{2}\hbox{O}_{8 + x}$ Wires

Lu, Xi Feng; Goodrich, Loren F.; Laan, D. C. van der; Splett, Jolene D.; Cheggour, Najib; Holesinger, T. G.; Baca, F. J.

doi:10.1109/tasc.2011.2174630

Cited by 13 publications

(18 citation statements)

References 26 publications

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“…In more recent work [52], increased reversibility was observed, and it is suggested that the irreversibility is a result of local stress concentrations around the porosity and voids that plague the present Bi-2212 wires (see Sec. 4), and that the behavior on the plateau is in principle intrinsic and related to strain-induced changes in the field-temperature phase boundary [53], similar to Nb 3 Sn [49], and as recently suggested for YBCO [55][56][57]. Overall, these trends hold promise for when Bi-2212 wires can eventually be made dense, which is required to increase the current density (Sec.…”

Section: Superconducting Materials and Conductors: Fabrication And LIsupporting

confidence: 66%

“…The behavior of superconductors under stress and strain is mainly determined through axial strain experiments on the wires and tapes [49][50][51][52][53][54][55][56][57][58], and through transverse pressure experiments on Rutherford cables [33,[59][60][61][62][63][64][65]. In the sections below we review the main results obtained to date.…”

Section: Mechanical Propertiesmentioning

confidence: 99%

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Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Bottura

Godeke

2012

Rev. Accl. Sci. Tech.

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Superconductivity is the technology that enabled the construction of the most recent generation of high-energy particle accelerators, the largest scientific instruments ever built. In this review we trace the evolution of superconducting materials for particle accelerator magnets, from the first steps in the late 1960s, through the rise and glory of Nb-Ti in the 1970s, till the 2010s, and the promises of Nb 3 Sn for the 2020s. We conclude with a perspective on the opportunities for high-temperature superconductors (HTSs). Many such reviews have been written in the past, as witnessed by the long list of references provided. In this review we put particular emphasis on the practical aspects of wire and tape manufacturing, cabling, engineering performance, and potential for use in accelerator magnets, while leaving in the background matters such as the physics of superconductivity and fundamental material issues.

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Section: Superconducting Materials and Conductors: Fabrication And LIsupporting

confidence: 66%

Section: Mechanical Propertiesmentioning

confidence: 99%

Superconducting Materials and Conductors: Fabrication and Limiting Parameters

Bottura

Godeke

2012

Rev. Accl. Sci. Tech.

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“…The strain dependence of B irr of sample IBAD has a clear maximum of 8.16 T near 0.1 % applied strain and decreases to about 7.68 T at 0.6 % and 7.04 T at −0.55 % strain. The strain dependence of B irr is most likely due to a change in T c with strain, as has been shown for Bi-2212 and Bi-2223 [2], [17].…”

Section: B Strain Effect On B Irr and Pinning Forcementioning

confidence: 72%

“…A REVERSIBLE strain effect has been measured in many high-temperature superconductors, where the critical current I c and the flux pinning force reversibly change with the strain in Bi 2 Sr 2 CaCu 2 O x (Bi-2212) wires and tapes [1], [2], Bi 2 Sr 2 Ca 2 Cu 3 O x (Bi-2223) tapes [3]- [6], and rare earth (RE)-Ba 2 Cu 3 O 7−δ (RE = Y, Gd, Dy, Sm, etc. ; REBCO) coated conductors [7]- [14].…”

Section: Introductionmentioning

confidence: 99%

“…Recent work has ruled out the theory that the reversible strain effect originates from grain boundaries, where dislocations may obstruct the grain boundary supercurrent [15], [16]. Instead, the effect can be fully explained by the uniaxial pressure dependence of the critical temperature T c in Bi-2212 wires and Bi-2223 tapes [2], [17]. Although such a correlation cannot be easily established in REBCO, due to the anisotropic nature of T c [18], a clear link between the uniaxial pressure dependence of T c and the reversible strain effect on I c has been recently established [19].…”

Section: Introductionmentioning

confidence: 99%

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Correlation Between In-Plane Grain Orientation and the Reversible Strain Effect on Flux Pinning in RE-$\hbox{Ba}_{2}\hbox{Cu}_{3}\hbox{O}_{7 - \delta}$ Coated Conductors

Laan

Douglas

Goodrich

et al. 2012

IEEE Trans. Appl. Supercond.

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The uniaxial pressure dependence of the critical temperature causes a reversible effect of strain on the critical current density and the flux pinning strength in many high-temperature superconductors. Recent experiments on patterned coated conductor bridges have shown that the anisotropic nature of the pressure dependence of the critical temperature of rare earth (RE)-Ba 2 Cu 3 O 7−δ (REBCO) has a major impact on the performance of coated conductors under strain. The strain effect on the critical current density is most prominent when the strain is along the [100] and [010] directions of the superconducting film, whereas it almost completely disappears when the strain is along [110]. In this paper, we investigate the correlation between the uniaxialpressure dependence of the critical temperature and the reversible strain effect on flux pinning in REBCO coated conductors. We show that axial strain has a large effect on the irreversibility field and the pinning force in coated conductors when the [100] and [010] directions of the superconducting film are aligned along the conductor axis. The magnitude of the strain effect in these conductors largely depends on the angle at which the magnetic field is applied. On the other hand, the critical temperature is not expected to change with the axial strain in coated conductors when the [110] direction is aligned along the conductor axis. Indeed, the irreversibility field and the magnetic field dependence of the pinning force of these conductors are almost independent of the axial strain for all angles at which the magnetic field is applied. The minor strain dependence of the critical current measured in these conductors could be caused by the average in-plane grain misalignment of between 6 • and 8 • , which causes a slight variation in the strain alignment with the axes of the superconducting film. The results confirm that the reversible strain effect in REBCO coated conductors is largely determined by the uniaxial pressure dependence of the critical temperature.

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