Abstract
In this study, we introduce the concept of high-entropy into high-temperature superconductors and report the successful synthesis of a series of high-entropy oxides, REBa2Cu3O7-δ (REBCO), with superconducting critical temperature (Tc) around 92 K. The superconductivity transition temperatures of these compounds are very close to that of the parent superconductor, YBa2Cu3O7-δ (YBCO). The temperatures of the zero-resistance appearing (Tczero), the critical current density (Jc) calculated from the hysteresis loop, and the irreversible fields (Hirr) of REBCO are not improved compared to that of YBCO. Our results indicate that the introduction of high-entropy elements with strong magnetic moments at RE site does not affect Tc, but may decrease other superconducting properties such as Jc, Tczero, and Hirr.
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