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In-Field Thermal Conductivity of Ag and Cu/Ag Ba1-xKxFe2As2 Composite Conductors

Published inIEEE transactions on applied superconductivity, vol. 31, no. 5, 7300105
Publication date2021-08
Abstract

This work reports the longitudinal thermal conductivity, κ, of Ag- and Cu/Ag-sheathed Ba 1-x K x Fe 2 As 2 conductors. Our investigation has been carried out between 4 K and 80 K with magnetic fields up to 19 T. In the case of Ag-sheathed tapes, the thermal conductivity reaches maximum values of ~80 Wm -1 K -1 and is weakly dependent on the field. The use of Cu/Ag in the place of Ag allows increasing κ up to ~250 Wm -1 K -1 . Zero-field κ values are about one order of magnitude lower than those achieved in other technical superconductors that employ a silver matrix, as Bi 2 Sr 2 CaCu 2 O 8+x (Bi2212) and Bi 2-x Pb x Sr 2 Ca 2 Cu 3 O 10-x (Bi2223). This is a consequence of the contamination of the metal sheaths because of elemental diffusion occurring during the tape sintering. The differences in κ between the Ba 1-x K x Fe 2 As 2 tapes and the other technical superconductors with an Ag matrix become smaller at high field. We suggest that performing the sintering at high pressure could represent a way to reduce the elemental contamination and thus improving the thermal conductivity.

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BONURA, Marco et al. In-Field Thermal Conductivity of Ag and Cu/Ag Ba<sub>1-x</sub>K<sub>x</sub>Fe<sub>2</sub>As<sub>2</sub> Composite Conductors. In: IEEE transactions on applied superconductivity, 2021, vol. 31, n° 5, p. 7300105. doi: 10.1109/TASC.2021.3052724
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