Mechanical and critical current characteristics of high-strength (Bi, Pb)2Sr2Ca2Cu3O10+δ tapes under uniaxial tensile strain. (14th January 2021)

• Record Type: Journal Article
• Authors: Okada, Tatsunori; Sakai, Kohei; Awaji, Satoshi
• Is Part Of: Superconductor science & technology. Volume 34:Number 2(2021)
• Publication Date: 2021-01-14
• Subjects: BSCCO -- critical current -- uniaxial strain -- irreversible strain -- irreversible stress -- irreversibility field; Superconductivity -- Periodicals; Superconductors -- Periodicals; 537.623
• DOI: 10.1088/1361-6668/abced2
• Languages: English
• ISSNs: 0953-2048

Abstract

Abstract: We investigated the mechanical properties and superconducting characteristics of high-strength (Bi, Pb)2 Sr2 Ca2 Cu3 O 10 + δ tapes reinforced by Ni-based alloy lamination over a wide range of temperature (30 K≤ T ≤ 300 K), magnetic field ( B ∥ c ≤ 6 T ), and uniaxial tensile strain ( ε ≤ 0.6%) conditions. We found that the Young's modulus evaluated from the stress–strain curves increases gradually with decreasing temperature (120 GPa at 300 K and 142 GPa at 40 K), indicating the importance of low- T data for designing high-field magnets. The enhancement of the Young's modulus of the tape at such low temperatures is probably attributable to the use of a Ni-based alloy for reinforcement and is also reflected in the irreversible stress. The critical current, I c, measured under various ( T, B, ε ) conditions decreases almost linearly with uniaxial tensile strain in the reversible region. We constructed a phenomenological model of I c ( T, B, ε ) that can roughly reproduce the observed I c under all the ( T, B, ε ) conditions we investigated. We expect that fine adjustment of the model parameters based on more detailed measurements will make it possible to estimate I c ( T, B, ε ) under arduous measurement conditions from data obtained under conditions where measurement is relatively easy.