Superconductivity of HTS REBCO Coated Conductors with Multi-Superconducting Layers

Superconductivity of HTS REBCO Coated Conductors with Multi-Superconducting Layers

We fabricated MHOS (multi-HTS layers on one substrate) high-temperature superconducting (HTS) REBCO conductors usingHTS REBCO coated conductor (CC) A-specimen, which induces an artificial magnetic flux pinning effect, and HTS REBCO CCB-specimen, that does not induce this effect. The superconducting magnetic properties of the fabricated MHOS conductors wereexamined by measuring their magnetic moment m(H) curves using a physical property measurement system (QD PPMS-14). Thecritical current density (Jc) characteristics of our four-layered MHOS HTS REBCO conductor specimens such as BAAB, BBBB,and AAAA were lower than those of their two-layered and three-layered counterparts. At a temperature T of 30 K the magnetic fluxpinning physical indicator δ values (obtained from the relationship Jc ∝ H-δ) of the three-layer ABA (δ = 0.35) and two-layer AB (δ= 0.43) specimens were found to be significantly lower than those of the four-layer ABBA (δ = 0.51), BAAB (δ = 0.60), AAAA (δ= 0.78) and BBBB (δ = 0.81) structures.

We fabricated MHOS (multi-HTS layers on one substrate) high-temperature superconducting (HTS) REBCO conductors usingHTS REBCO coated conductor (CC) A-specimen, which induces an artificial magnetic flux pinning effect, and HTS REBCO CCB-specimen, that does not induce this effect. The superconducting magnetic properties of the fabricated MHOS conductors wereexamined by measuring their magnetic moment m(H) curves using a physical property measurement system (QD PPMS-14). Thecritical current density (Jc) characteristics of our four-layered MHOS HTS REBCO conductor specimens such as BAAB, BBBB,and AAAA were lower than those of their two-layered and three-layered counterparts. At a temperature T of 30 K the magnetic fluxpinning physical indicator δ values (obtained from the relationship Jc ∝ H-δ) of the three-layer ABA (δ = 0.35) and two-layer AB (δ= 0.43) specimens were found to be significantly lower than those of the four-layer ABBA (δ = 0.51), BAAB (δ = 0.60), AAAA (δ= 0.78) and BBBB (δ = 0.81) structures.