Tunneling spectroscopy of high-Tc superconductors

Applied Superconductivity Pub Date : 1999-10-01 DOI:10.1016/S0964-1807(99)00042-3

L Alff , A Marx , R Gross , A Beck , H Takashima , S Kashiwaya , M Koyanagi , Y Tanaka

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引用次数: 2

Abstract

We have performed tunneling spectroscopy experiments on different kinds of high-temperature superconductors (HTS) and different types of junctions. Firstly, spectra were taken on surfaces of YBa₂Cu₃O_7-δ (YBCO) thin films and Nd_1.85Ce_0.15CuO_4-y (NCCO) single crystals by low-temperature scanning tunneling microscopy/spectroscopy (LTSTM/S) in a superconductor-insulator-normal metal (SIN) configuration. Second, the tunneling spectra of grain-boundary junctions (GBJs) fabricated on bicrystal substrates were measured for the materials YBCO, La_1.85Sr_0.15CuO_4-δ (LSCO), Bi₂Sr₂CaCu₂O_8+δ (BSCCO) and NCCO in a SIS configuration. The characteristics of the spectra in both systems could be related to the symmetry of the order parameter in the superconducting electrode(s). In particular, a zero bias conductance peak (ZBCP) was observed only in systems with a d-wave symmetry, but was completely absent in the s-wave system NCCO.

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高温超导体的隧穿光谱

我们对不同种类的高温超导体和不同类型的结进行了隧道光谱实验。首先，利用低温扫描隧道显微镜/光谱学(LTSTM/S)对YBa2Cu3O7-δ (YBCO)薄膜和Nd1.85Ce0.15CuO4-y (NCCO)单晶表面进行了超导体-绝缘体-正常金属(SIN)结构的光谱分析。其次，测量了YBCO、La1.85Sr0.15CuO4-δ (LSCO)、Bi2Sr2CaCu2O8+δ (BSCCO)和NCCO等材料在SIS构型下在双晶衬底上制作的晶界结(GBJs)的隧穿光谱。这两种体系的光谱特征可能与超导电极中序参量的对称性有关。特别是，零偏导峰(ZBCP)仅在具有d波对称的系统中观察到，而在s波系统NCCO中完全没有。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Applied Superconductivity

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