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arXiv 1004.1882cond-mat.supr-concond-mat.str-el
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重费米子超导体中的点接触谱学

Point-contact spectroscopy in heavy-fermion superconductors

Mikael Fogelström, W. K. Park, L. H. Greene, G. Goll, Matthias. J. Graf

摘要:

我们发展了一个极小模型来计算金属针尖与超导重费米子系统之间的点接触谱。我们应用我们的隧道模型的重费米子CeCoIn 5,在正常和超导状态。在点接触和扫描隧道光谱中,许多重费米子材料,如CeCoIn 5,表现出不对称的微分电导dI/dV,并在超导状态下强烈抑制Andreev反射信号。我们认为,这两个功能可以解释在一个多通道隧道模型中存在的局域态界面附近。我们发现,隧道进入两个巡回带的轻,重电子来解释Fano线形状的微分电导是不够的。当电子从点接触的金属尖端隧穿进入重费米子系统时,体中或界面附近的局域态是量子干涉发生的重要组成部分。

英文摘要:

We develop a minimal model to calculate point-contact spectra between a metallic tip and a superconducting heavy-fermion system. We apply our tunneling model to the heavy fermion CeCoIn5, both in the normal and superconducting state. In point-contact and scanning tunneling spectroscopy many heavy-fermion materials, like CeCoIn5, exhibit an asymmetric differential conductance, dI/dV, combined with a strongly suppressed Andreev reflection signal in the superconducting state. We argue that both features may be explained in terms of a multichannel tunneling model in the presence of localized states near the interface. We find that it is not sufficient to tunnel into two itinerant bands of light and heavy electrons to explain the Fano line shape of the differential conductance. Localized states in the bulk or near the interface are an essential component for quantum interference to occur when an electron tunnels from the metallic tip of the point contact into the heavy-fermion system.

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