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

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2011

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Piano, Samanta
Grein, Roland
Mellor, Christopher J.
Výborný, Karel
Campion, Richard
Wang, M.
Gallagher, Bryan

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http://nbn-resolving.de/urn:nbn:de:bsz:352-124266
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https://doi.org/10.1103/PhysRevB.83.081305
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http://arxiv.org/abs/1008.1788v1

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Physical Review B. 2011, 83(8). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.83.081305

Zusammenfassung

We investigate the spin-polarization of the ferromagnetic semiconductor (Ga,Mn)As by Andreev point contact spectroscopy. We analyze the conductance spectra with the theoretical model of [R. Grein et al., Phys. Rev. B 81, 094508 (2010)], which accounts for momentum- and spin-dependent scattering at the interface. We show that this allows for fitting the data without resorting to an effective temperature or statistical distribution of superconducting gaps, as it is the case for the spin-dependent version of the standard Blonder-Tinkham-Klapwijk (BTK) model. We find a transport polarization P_C of about 56% at the Fermi level and comparing it to the k.p kinetic-exchange model of (Ga,Mn)As, we achieve a considerably better agreement than estimates inferred from the spin-dependent BTK model which are significantly higher. The temperature dependence of the conductance spectra is fully analyzed.

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530 Physik

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ISO 690PIANO, Samanta, Roland GREIN, Christopher J. MELLOR, Karel VÝBORNÝ, Richard CAMPION, M. WANG, Matthias ESCHRIG, Bryan GALLAGHER, 2011. Spin polarization of (Ga,Mn)As measured by Andreev Spectroscopy : The role of spin-active scattering. In: Physical Review B. 2011, 83(8). ISSN 1098-0121. Available under: doi: 10.1103/PhysRevB.83.081305
BibTex
@unpublished{Piano2011polar-12426,
  year={2011},
  doi={10.1103/PhysRevB.83.081305},
  title={Spin polarization of (Ga,Mn)As measured by Andreev Spectroscopy : The role of spin-active scattering},
  author={Piano, Samanta and Grein, Roland and Mellor, Christopher J. and Výborný, Karel and Campion, Richard and Wang, M. and Eschrig, Matthias and Gallagher, Bryan},
  note={Also publ. in: Physical Review B ; 83 (2011), 8. - 081305}
}
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Also publ. in: Physical Review B ; 83 (2011), 8. - 081305
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