Observation of Andreev Bound States at Spin-active Interfaces

被引：34

作者：

Huebler, F. ^{[1
,2
,3
]}

Wolf, M. J. ^{[1
]}

Scherer, T. ^{[1
,4
]}

Wang, D. ^{[1
,4
]}

Beckmann, D. ^{[1
,2
]}

v. Loehneysen, H. ^{[2
,3
,5
]}

机构：

[1] Karlsruher Inst Technol, Inst Nanotechnol, Karlsruhe, Germany

[2] Karlsruher Inst Technol, Ctr Funct Nanostruct, Karlsruhe, Germany

[3] Karlsruher Inst Technol, Inst Festkorperphys, Karlsruhe, Germany

[4] Karlsruher Inst Technol, Karlsruhe Nano Micro Facil, Karlsruhe, Germany

[5] Karlsruher Inst Technol, Inst Phys, Karlsruhe, Germany

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 08期

关键词：

SUPERCONDUCTOR-FERROMAGNET STRUCTURES; TRIPLET SUPERCONDUCTIVITY; TUNNELING SPECTROSCOPY; SUPERCURRENTS; SCATTERING; JUNCTIONS; SR2RUO4; KONDO;

D O I：

10.1103/PhysRevLett.109.087004

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We report on high-resolution differential conductance experiments on nanoscale superconductor-ferromagnet tunnel junctions with ultrathin oxide tunnel barriers. We observe subgap conductance features that are symmetric with respect to bias and shift according to the Zeeman energy with an applied magnetic field. These features can be explained by resonant transport via Andreev bound states induced by spin-active scattering at the interface. From the energy and Zeeman shift of the bound states, both the magnitude and sign of the spin-dependent interfacial phase shifts between spin-up and spin-down electrons can be determined. These results contribute to the microscopic insight into the triplet proximity effect at spin-active interfaces.

引用

页数：5

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