Effect of non-hydrostatic stress on the superconducting transition of A15 compounds with high critical temperature

Pietrass, B.

doi:10.1002/pssa.2210600214

Cited by 9 publications

(3 citation statements)

References 22 publications

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“…An analysis was done previously giving a model for tetragonal strain dependence, using a simple series expression of the strain dependence of [5]. The shear terms were eliminated to leave only a dependence on tetragonal strain, and thereby guarantee a prediction of resistive transition broadening with strain.…”

Section: Measurements and Discussionmentioning

confidence: 99%

Strain Dependence of the Critical Temperature $T_{c}$ of Polycrystalline ${\rm Nb}_{3}{\rm Sn}$ Superconductors

Markiewicz

2007

IEEE Trans. Appl. Supercond.

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The polycrystalline nature of Nb 3 Sn introduces crystal orientation as a possible variable in the strain dependence of the critical properties. It is shown that a dependence of strain sensitivity on crystal orientation implies a dependence on strain of the distribution of , with implications for the functional dependence of strain sensitivity on the strain tensor. The distribution of is found to have an influence on the characteristics of the resistive transition of . Calculations of the resistive transition are done under alternative assumptions for the crystal orientation dependence of strain sensitivity. Available data on the strain dependence of the transition of are contradictory and inconclusive. If strain sensitivity were found to be independent of grain orientation, that would imply a strain dependence on the entire deviatoric strain tensor, through the scalar invariants, including the tetragonal and shear parts. This would be a surprising conclusion given the emphasis on tetragonal strain in Nb 3 Sn.Index Terms-Critical temperature, polycrystalline Nb3Sn, strain dependence.

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Section: Measurements and Discussionmentioning

confidence: 99%

Strain Dependence of the Critical Temperature $T_{c}$ of Polycrystalline ${\rm Nb}_{3}{\rm Sn}$ Superconductors

Markiewicz

2007

IEEE Trans. Appl. Supercond.

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“…The random orientation of the grains in Nb 3 Sn wires will result in the average value of dT * ci /dε JD | εJD=0% being lower. We have taken an approximate average over all solid angles to obtain dT * cA /dε JD | εJD=0% = 0.24 × dT * c100 /dε JD | εJD=0% = 0.39 K% −1 [62]. Single crystal data for Nb 3 Al is not available.…”

Section: The Chain Model For Internal Tin Nb 3 Sn and Jelly-roll Nb 3 Almentioning

confidence: 99%

“…We consider the evidence for grains with different strain dependencies (i.e. multimodal behaviour) [61,62] as well as discussing the role of grain boundaries.…”

Section: Introductionmentioning

confidence: 99%

Weak emergence in the angular dependence of the critical current density of the high temperature superconductor coated conductor REBCO

Branch

Osamura²,

Hampshire

2020

Supercond. Sci. Technol.

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Extensive critical current density J c measurements are reported as a function of magnetic field B, temperature T, angle θ between the applied field and the surface of the tape, and strain ε, on a REBCO coated conductor. The strain, ε peak (B, T, θ), at which J c (ε app ) is maximised, is a function of B, T, and θ, which is consistent with weakly emergent behaviour. It is described by the chain model that considers competition between twinned domains with different crystallographic orientations and opposing responses under an applied uniaxial strain.Detailed effective upper critical field B * c2 (T, ε app , θ = 0) data are presented that show universal temperature and strain scaling. They lead to an accurate flux pinning relation for the volume pinning force,q , where b = B/B * c2 (T, ε app , θ = 0) and p and q are constants, and are used to help parameterise the scaling behaviour of the angular J c data more accurately in those cases where B * c2 cannot be measured directly. We derive approximate analytic in-field expressions that explain how the fraction, f, of a-domains amongst the a-and b-domains affects the strain dependence of the critical parameters and conclude that in our tape, f = 0.4, and the strain at which J c is the same in both domains is ε JcA=JcB = 0.15 %. We report a sharp peak in J c as the applied field approaches alignment with the ab-plane and the unusual result that with it, a suppression of the index of transition N also occurs. We find that the effective upper critical field B * c2 increases as the field angle approaches the ab-plane significantly faster than any available theoretical model for the upper critical field B c2 .In addition, we conclude that a weak-emergence description is not limited to high temperature superconductors, but also describes some low-temperature superconductors.

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Hydrogenated and irradiatedA15 Nb3Sn layers ? Preparation, Rutherford scattering analysis, resistivity and superconductivity

Nölscher

Müller

Adrian

et al. 1981

Z. Physik B - Condensed Matter

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Effect of non-hydrostatic stress on the superconducting transition of A15 compounds with high critical temperature

Cited by 9 publications

References 22 publications

Strain Dependence of the Critical Temperature $T_{c}$ of Polycrystalline ${\rm Nb}_{3}{\rm Sn}$ Superconductors

Strain Dependence of the Critical Temperature $T_{c}$ of Polycrystalline ${\rm Nb}_{3}{\rm Sn}$ Superconductors

Weak emergence in the angular dependence of the critical current density of the high temperature superconductor coated conductor REBCO

Hydrogenated and irradiatedA15 Nb3Sn layers ? Preparation, Rutherford scattering analysis, resistivity and superconductivity

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