Point-contact spectroscopy of Cu0.2Bi2Se3 single crystals

Point-contact spectroscopy of Cu0.2Bi2Se3 single crystals
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DOI:
10.1103/physrevb.86.064517
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发表时间:
2012-08-16
期刊:
影响因子:
3.7
通讯作者:
Kanigel, A.
Kanigel, A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Kirzhner, T.;Lahoud, E.;Kanigel, A.

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我们报告了高质量 Cu0.2Bi2Se3 单晶的点接触测量。我们观察到三种不同的光谱:(1)Andreev反射光谱,从中我们推断出超导带隙尺寸为0.6 mV; (2) 具有大间隙的光谱,其在 T-c 以上大约 10 K 处闭合; (3)具有零偏置电导峰的隧道状光谱。这些隧道光谱显示出非常大的间隙,类似于 2 meV(2 Delta/KbTc 类似于 14)。
We report point-contact measurements in high-quality single crystals of Cu0.2Bi2Se3. We observe three different kinds of spectra: (1) Andreev-reflection spectra, from which we infer a superconducting gap size of 0.6 mV; (2) spectra with a large gap which closes above T-c at about 10 K; and (3) tunnelinglike spectra with zero-bias conductance peaks. These tunneling spectra show a very large gap of similar to 2 meV (2 Delta/KbTc similar to 14).