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To search for new evidence of the chiral p -wave superconducting domain in Sr 2 RuO 4 , we investigated the unconventional local transport characteristics of a microfabricated Sr 2 RuO 4 –Ru eutectic junction. We found that the anomalous hysteresis in voltage–current characteristics [as reported in Kambara et al. : Phys. Rev. Lett. 101 (2008) 267003] is strongly affected by dc currents, but not by magnetic fields. This suggests that dc current acts as a driving force to move chiral p -wave domain walls; a domain wall trapped at a pinning potential is forced to shift to the next stable position, thereby forming a larger critical current path and resulting in the anomalous hysteresis.

DC Current Driven Critical Current Variation in Sr2RuO4–Ru Junction Proved by Local Transport Measurements

DC Current Driven Critical Current Variation in Sr₂RuO₄–Ru Junction Proved by Local Transport Measurements