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

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

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

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Datum

2011

Autor:innen

Piano, Samanta

Grein, Roland

Mellor, Christopher J.

Výborný, Karel

Campion, Richard

Wang, M.

Eschrig, Matthias

Gallagher, Bryan

Publikationstyp

Preprint

Publikationsstatus

Published

Erschienen in

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.

Fachgebiet (DDC)

530 Physik

Zitieren

ISO 690

PIANO, 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@unpublished{Piano2011polar-12426,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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Kommentar zur Publikation

Also publ. in: Physical Review B ; 83 (2011), 8. - 081305

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