Magnetoresistance Measurements of a Superconducting Surface State of In-Induced and Pb-Induced Structures on Si(111)

被引：126

作者：

Yamada, Manabu ^{[1
]}

Hirahara, Toru ^{[1
]}

Hasegawa, Shuji ^{[1
]}

机构：

[1] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 23期

基金：

日本学术振兴会;

关键词：

FILMS;

D O I：

10.1103/PhysRevLett.110.237001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In situ micro-four-point-probe conductivity measurements in ultrahigh vacuum revealed that the Si(111)-striped incommensurate-Pb surface showed the superconductivity transition at 1.1 K. Both of the hexagonal and rectangular phases of Si(111) root 7 x root 3-In surface showed superconductivity at 2.4 and 2.8 K, respectively. By applying magnetic field perpendicular to the surface, the upper critical field was deduced to be 0.1-1 T. The derived Ginzburg-Landau coherence length of the Cooper pairs was several tens of nm, which was much smaller than the Pippard's coherence length estimated from the band structures. The short coherence length is determined by the carrier mean free path.

引用

页数：5

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