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Weakly-Emergent Strain Dependent Properties of High Field Superconductors [dataset] Open Access

All superconductors in high field magnets operating above 12 T are brittle and subjected to large strains because of the differential thermal contraction between component parts on cool-down and the large Lorentz forces produced in operation. The continuous scientific requirement for higher magnetic fields in superconducting energy-efficient magnets means we must understand and control the high sensitivity of critical current density Jc to strain ε. Here we present very detailed Jc(B, θ, T, ε) measurements on a high temperature superconductor (HTS), a (Rare−Earth)Ba2Cu3O7−δ (REBCO) coated conductor, and a low temperature superconductor (LTS), a Nb3Sn wire, that include the very widely observed inverted parabolic strain dependence for Jc(ε). The canonical explanation for the parabolic strain dependence of Jc in LTS wires attributes it to an angular average of an underlying intrinsic parabolic single crystal response. It assigns optimal superconducting critical parameters to the unstrained state which implies that Jc(ε) should reach its peak value at a single strain (ε = εpeak), independent of field B, and temperature T. However, consistent with a new analysis, the high field measurements reported here provide a clear signature for weakly-emergent behaviour, namely εpeak is markedly B, (field angle θ for the HTS) and T dependent in both materials. The strain dependence of Jc in these materials is termed weakly-emergent because it is not qualitatively similar to the strain dependence of Jc of any of their underlying component parts, but is amenable to calculation. We conclude that Jc(ε) is an emergent property in both REBCO and Nb3Sn conductors and that for the LTS Nb3Sn conductor, the emergent behaviour is not consistent with the long-standing canonical explanation for Jc(ε).

Descriptions

Resource type

Dataset

Contributors

Creator: Hampshire, Damian ¹
Contact person: Hampshire, Damian ¹
Data collector: Paul Branch ¹

¹ Durham University, UK

Funder

Engineering and Physical Sciences Research Council

Research methods

Other description

Keyword

Superconductivity

Subject

Superconductivity

Location

Language

Cited in

doi:10.1038/s41598-019-50266-1

Identifier

ark:/32150/gh93gz496
doi:10.15128/gh93gz496

Rights

Creative Commons Attribution 4.0 International (CC BY)

Publisher

Durham University

Date Created

2015-08-07T00:00:00.000+00:00

File Details

Depositor

S. Palucha

Date Uploaded

12 October 2015, 14:10:57

Date Modified

15 October 2019, 17:10:51

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File format: zip (ZIP Format)

Mime type: application/zip

File size: 127950

Last modified: 2019:10:15 13:05:28+01:00

Filename: DOI Data Branch 2019.zip

Original checksum: 0322cb3e4e4b4b2e11a2d3a744709a9f