Abstract
The formation of a mixed state in YBa2Cu3O7−x superconductors during the transport current buildup (i.e., under the action of the internal magnetic field) at T=77 K was detected by method of acoustic emission (AE). The AE signals were detected for the currents of I=0.5 and 2.7 A. The former signal corresponds to the lower critical magnetic field (Hc1), as was established previously [4]. It is shown that the latter signal corresponds to the formation of a mixed state. Application of the AE method to detecting overloads in high-power superconducting circuits is considered.
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