Abstract
The effects of high-pressure sintering on the critical current density J c in superconducting wires of (Ba 0.6 K 0.4 )Fe 2 As 2 and (Sr 0.6 K 0.4 )Fe 2 As 2 fabricated by the powder-in-tube technique were studied. The high-pressure sintering was conducted using the hot isostatic pressing (HIP) technique in a pressure up to 120 MPa. Local measurements on the magnetic induction distribution of the wire core in the critical state using magnetooptical imaging demonstrate that a uniform shielding current is flowing and intergranular couplings are very strong. Self-field J c up to 1 × 10 5 A/cm 2 is achieved in wires processed at 120 MPa and 700°C. A systematic measurement of J c in HIP-processed (Ba 0.6 K 0.4 )Fe 2 As 2 wires demonstrates that J c increases steadily with the pressure during the high-pressure sintering. On the other hand, the obtained J c depends sensitively on the temperature during the high-pressure sintering, and the duration of the high-pressure sintering also affects the value of J c .
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