Abstract
Thin films of REBa2Cu3O7−δ (RE123, RE: rare earth) having a high-entropy (HE) RE site were successfully fabricated by the pulsed laser deposition method. Solution various RE elements result in increasing configurational entropy of mixing. Critical current density of the HE films exceeds an order of 1.0 MA cm−2 under conditions of T < 20 K and μ 0 H < 7 T. Since the HE effects have a potential to an improvement of irradiation tolerance, the present results encourage further development of HE RE123 superconducting materials used in the environment with high magnetic fields and irradiation, for example in fusion reactors.
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