Spin polarization of (Ga,Mn)As measured by Andreev spectroscopy: The role of spin-active scattering

被引：24

作者：

Piano, S. ^{[1
]}

Grein, R. ^{[2
,3
]}

Mellor, C. J. ^{[1
]}

Vyborny, K. ^{[4
]}

Campion, R. ^{[1
]}

Wang, M. ^{[1
]}

Eschrig, M. ^{[2
,3
,5
,6
]}

Gallagher, B. L. ^{[1
]}

机构：

[1] Univ Nottingham, Sch Phys & Astron, Nottingham NG7 2RD, England

[2] Karlsruhe Inst Technol, Inst Theoret Festkorperphys, D-76128 Karlsruhe, Germany

[3] Karlsruhe Inst Technol, DFG Ctr Funct Nanostruct, D-76128 Karlsruhe, Germany

[4] Inst Phys ASCR, Vvi, CZ-16253 Prague 6, Czech Republic

[5] Univ Konstanz, Fachbereich Phys, D-78457 Constance, Germany

[6] Univ London, Dept Phys, SEPnet & Hubbard Theory Consortium, Egham TW20 0EX, Surrey, England

来源：

PHYSICAL REVIEW B | 2011年 / 83卷 / 08期

关键词：

SUPERCONDUCTOR; SPINTRONICS; REFLECTION; INJECTION;

D O I：

10.1103/PhysRevB.83.081305

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We investigate the spin polarization of the ferromagnetic semiconductor (Ga,Mn)As by point-contact Andreev reflection spectroscopy. The conductance spectra are analyzed using a recent theoretical model that accounts for momentum-and spin-dependent scattering at the interface. This allows us to fit the data without resorting, as in the case of the standard spin-dependent Blonder-Tinkham-Klapwijk (BTK) model, to an effective temperature or a statistical distribution of superconducting gaps. We find a transport polarization P-C approximate to 57%, in considerably better agreement with the (k) over right arrow center dot (p) over right arrow p kinetic-exchange model of (Ga, Mn) As, than the significantly larger estimates inferred from the BTK model. The temperature dependence of the conductance spectra is fully analyzed.

引用

页数：4

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