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arXiv 1306.3042cond-mat.supr-con
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超导体LaSb2的扫描隧道显微术

Scanning Tunneling Microscopy in the superconductor LaSb2

J. A. Galvis, H. Suderow, S. Vieira, S. L. Bud'ko, P. C. Canfield

摘要:

我们目前非常低的温度(0.15 K)的层状超导体LaSb $_2$的扫描隧道显微镜和光谱实验。我们获得的表面形貌显微镜图像显示六边形和正方形的原子尺寸图案,并观察在隧道电导的超导能隙。我们发现定义良好的准粒子峰位于一个偏置电压相媲美的弱耦合s-波BCS预期的间隙值(0.17毫电子伏)。然而,费米能级处的态的数量很大,并且曲线明显变宽。我们发现T $_c$的1.2 K以下的隧道电导与温度。

英文摘要:

We present very low temperature (0.15 K) scanning tunneling microscopy and spectroscopy experiments in the layered superconductor LaSb$_2$. We obtain topographic microscopy images with surfaces showing hexagonal and square atomic size patterns, and observe in the tunneling conductance a superconducting gap. We find well defined quasiparticle peaks located at a bias voltage comparable to the weak coupling s-wave BCS expected gap value (0.17 meV). The amount of states at the Fermi level is however large and the curves are significantly broadened. We find T$_c$ of 1.2 K by following the tunneling conductance with temperature.

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