Superconducting Energy Gap Features of FeSe Investigated by Tunneling Spectroscopy on Planar Junctions
Superconducting Energy Gap Features of FeSe Investigated by Tunneling Spectroscopy on Planar Junctions
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DOI：
10.1007/s10948-015-3364-3
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发表时间：
2015-06
影响因子：
1.8
通讯作者：
Eike Venzmer;Alexander Kronenberg;M. Jourdan
中科院分区：
文献类型：
--
作者：
Eike Venzmer;Alexander Kronenberg;M. Jourdan
制备并研究了可能是非常规超导体FeSe的平面隧穿结。该结由射频溅射FeSe/AlOx/Ag多层光刻成台面结构图案。偏置电压依赖的微分电导率dI/dV（V）的隧道，中间势垒强度，和金属制度的结进行了研究。根据势垒类型之间的两个到四个功能的电导率，这是讨论的框架中的多个超导能隙。具体来说，我们用所有势垒类型再现了两个已建立的能隙，并确定了另一个特征可能源于额外的大超导能隙。另一导电性特征可以与谐振状态相关联。
Planar tunneling junctions of the presumably unconventional superconductor FeSe were prepared and investigated. The junctions consisted of rf-sputtered FeSe/AlOx/Ag multilayers patterned lithographically into mesa structures. Bias voltage-dependent differential conductivities dI/dV(V) of junctions in the tunneling, intermediate barrier strength, and metallic regimes were investigated. Depending on the barrier type between two to four features of the conductivity were obtained, which are discussed in the framework of multiple superconducting energy gaps. Specifically, we reproduced with all barrier types two established energy gaps and identified another feature as presumably originating from an additional large superconducting gap. A further conductivity feature could be associated with a resonant state.