Effect of Transport-Induced Charge Inhomogeneity on Point-Contact Andreev Reflection Spectra at Ferromagnet-Superconductor Interfaces

被引：4
|
作者：
Hsu, Ya-Fen [1 ,2 ]
Chiang, Tien-Wei [1 ,2 ,3 ]
Guo, Guang-Yu [1 ,2 ,4 ]
Lee, Shang-Fan [3 ]
Liang, Jun-Jih [5 ]
机构：
[1] Natl Taiwan Univ, Dept Phys, Taipei 10617, Taiwan
[2] Natl Taiwan Univ, Ctr Theoret Sci, Taipei 10617, Taiwan
[3] Acad Sinica, Inst Phys, Taipei 11529, Taiwan
[4] Natl Chengchi Univ, Grad Inst Appl Phys, Taipei 11605, Taiwan
[5] Fu Jen Catholic Univ, Dept Phys, Taipei 24205, Taiwan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2012年 / 81卷 / 08期
关键词：
Andreev reflection; point contact; spin-polarization; ferromagnet; superconductor; HEAVY-FERMION SUPERCONDUCTORS; SPIN POLARIZATION; TUNNELING SPECTROSCOPY; JUNCTIONS; CONDUCTANCE; TRANSITION; UBE13; BIAS;
D O I：
10.1143/JPSJ.81.084704
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We investigate the transport properties of a ferromagnet-superconductor interface within the framework of a modified three-dimensional Blonder-Tinkham-Klapwijk formalism. In particular, we propose that charge inhomogeneity forms via two unique transport mechanisms, namely, evanescent Andreev reflection and evanescent quasiparticle transmission. Furthermore, we take into account the influence of charge inhomogeneity on the interfacial barrier potential and calculate the conductance as a function of bias voltage. Point-contact Andreev reflection (PCAR) spectra often show dip structures, large zero-bias conductance enhancement, and additional zero-bias conductance peak. Our results indicate that transport-induced charge inhomogeneity could be a source of all these anomalous characteristics of the PCAR spectra.
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页数：8
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