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Observation of Andreev Surface Bound States in the 3-K phase Region of Sr_2RuO_4

Z. Q. Mao·K. D. Nelson·R. Jin·Y. Liu·Y. Maeno
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Abstract

The tunneling spectrum of the superconducting phase with T_c ~ 3.0 K has been measured in the Ru-embedded region of Sr_2RuO_4 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 T_c of Sr_2RuO_4 (~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 T_c.

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Z. Q. Mao, K. D. Nelson, R. Jin, Y. Liu, Y. Maeno. 2001-06-12. Observation of Andreev Surface Bound States in the 3-K phase Region of Sr_2RuO_4. https://doi.org/10.1103/physrevlett.87.037003

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