Observation of Andreev Surface Bound States in the 3-K phase Region of Sr2RuO4
Abstract
The tunneling spectrum of the superconducting phase with Tc ~ 3.0 K has been measured in the Ru-embedded region of Sr2RuO4 using cleaved junctions. A sharp zero-bias conductance peak (ZBCP) has been observed below 3 K. All characteristics of this ZBCP suggest that it originates from Andreev surface bound states, indicating that the pairing in the 3-K phase is also non-s-wave. Below the bulk Tc of Sr2RuO4 (~1.5 K), a bell-shaped ZBCP was found. This supports that there is a phase transition in the 3-K phase region near the bulk Tc.
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