TY - JOUR
T1 - Mechanical and critical current characteristics of high-strength (Bi, Pb)2Sr2Ca2Cu3O10+δ tapes under uniaxial tensile strain
AU - Okada, Tatsunori
AU - Sakai, Kohei
AU - Awaji, Satoshi
N1 - Funding Information:
We are grateful to Dr Gen Nishijima at NIMS for allowing us to use his lever-type tension instrument and cryostat, and for fruitful discussions. This research was performed at the High Field Laboratory for Superconducting Materials, Institute for Materials Research, Tohoku University (Project Numbers: 19H0410, 20H0405, and 20H0413) and supported by JSPS KAKENHI (Early-Career Scientists: 18K13783 and Grant-in-Aid for Scientific Research(S): 18H05248).
Publisher Copyright:
© 2021 IOP Publishing Ltd.
PY - 2021/2
Y1 - 2021/2
N2 - We investigated the mechanical properties and superconducting characteristics of high-strength (Bi, Pb)2Sr2Ca2Cu3O10+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, Ic, measured under various (T, B, ε) conditions decreases almost linearly with uniaxial tensile strain in the reversible region. We constructed a phenomenological model of Ic(T, B, ε) that can roughly reproduce the observed Ic 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 Ic(T, B, ε) under arduous measurement conditions from data obtained under conditions where measurement is relatively easy.
AB - We investigated the mechanical properties and superconducting characteristics of high-strength (Bi, Pb)2Sr2Ca2Cu3O10+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, Ic, measured under various (T, B, ε) conditions decreases almost linearly with uniaxial tensile strain in the reversible region. We constructed a phenomenological model of Ic(T, B, ε) that can roughly reproduce the observed Ic 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 Ic(T, B, ε) under arduous measurement conditions from data obtained under conditions where measurement is relatively easy.
KW - BSCCO
KW - Critical current
KW - Irreversibility field
KW - Irreversible strain
KW - Irreversible stress
KW - Uniaxial strain
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U2 - 10.1088/1361-6668/abced2
DO - 10.1088/1361-6668/abced2
M3 - Article
AN - SCOPUS:85100356884
VL - 34
JO - Superconductor Science and Technology
JF - Superconductor Science and Technology
SN - 0953-2048
IS - 2
M1 - 025017
ER -