Observation of a mixed pairing state in Ru microdomains embedded in Sr₂ Ru O₄
Long, Z. · Andreou, C. · Mao, Z. Q. · Yaguchi, H. · Maeno, Y. · Liu, Y.
Original · EN
We report first measurements on tunneling into the interior of a Ru microdomain embedded in bulk chiral p-wave superconductor Sr₂RuO₄. The junctions were prepared by pressing a pure In wire onto the ab face of a Ru-containing Sr₂RuO₄ single crystal. Below the superconducting transition temperature (Tc) of Sr₂RuO₄ (= 1.5 K), we observed a zero-bias conductance peak (ZBCP) associated with the proximity-induced p-wave superconductivity. However, below 0.44 K, roughly the Tc of bulk Ru (= 0.5 K), an unexpected Ru gap and a broad ZBCP superimposed with subgap features were found to emerge, with unusual magnetic field dependences. We argue that the new features resulted from a mixed pairing state featuring intrinsic s- and p-wave condensates in the interior of a Ru microdomain embedded in Sr₂RuO₄.
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