Hysteretic superconducting resistive transition in Ba0.07K0.93Fe2As2
Abstract
We have observed hysteresis in superconducting resistive transition curves of Ba0.07K0.93Fe2As2 (Tc8 K) below about 1 K for in-plane fields. The hysteresis is not observed as the field is tilted away from the ab plane by 20 or more. The temperature and angle dependences of the upper critical field indicate a strong paramagnetic effect for in-plane fields. We suggest that the hysteresis can be attributed to a first-order superconducting transition due to the paramagnetic effect. Magnetic torque data are also shown.
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