Point-contact Andreev-reflection spectroscopy of doped manganites: Charge carrier spin-polarization and proximity effects (Review Article)

Автор(и)

  • V.N. Krivoruchko A.A. Galkin Donetsk Physics and Technology Institute National Academy of Sciences of the Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
  • A.I. D’yachenko A.A. Galkin Donetsk Physics and Technology Institute National Academy of Sciences of the Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine
  • V.Yu. Tarenkov A.A. Galkin Donetsk Physics and Technology Institute National Academy of Sciences of the Ukraine 72 R. Luxemburg Str., Donetsk 83114, Ukraine

DOI:

https://doi.org/10.1063/1.4795172

Ключові слова:

current spin polarization, Andreev-reflection spectroscopy, ferromagnetic manganites, unconventional pairing.

Анотація

Materials with spin-polarized charge carriers are the most demanded in the spin-electronics. Particularly requested are the so-called half-metals which have the maximum attainable value of carrier spin polarization. Doped manganites are in the list of compounds with, potentially, half-metallic properties. The point-contact (PC) Andreevreflection (AR) spectroscopy is a robust and direct method to measure the degree of current spin polarization. In this report, advances in PCAR spectroscopy of ferromagnetic manganites are reviewed. The experimental results obtained on “classic” s-wave superconductor — ferromagnetic manganites PCs, as well as related theoretical models applied to deduce the actual value of charge carrier spin-polarization, are discussed. Data obtained on “proximity affected” contacts is also outlined. Systematic and repeatable nature of a number of principal experimental facts detected in the AR spectrum of proximity affected contacts suggests that some new physical phenomena have been documented here. Different models of current flow through a superconductor–half-metal ferromagnet interface, as well as possibility of unconventional superconducting proximity effect, have been discussed.

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Опубліковано

2013-01-17

Як цитувати

(1)
Krivoruchko, V.; D’yachenko, A.; Tarenkov, V. Point-Contact Andreev-Reflection Spectroscopy of Doped Manganites: Charge Carrier Spin-Polarization and Proximity Effects (Review Article). Fiz. Nizk. Temp. 2013, 39, 276-292.

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