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An unconventional iron superconductor, SmO0.7F0.3FeAs, has been utilized to determine the spin polarization and temperature dependence of a highly spin-polarized material, La0.67Sr0.33MnO3, with Andreev reflection spectroscopy. The polarization value obtained is the same as that determined using a conventional superconductor Pb but the temperature dependence of the spin polarization can

An unconventional iron superconductor, SmO0.7F0.3FeAs, has been utilized to determine the spin polarization and temperature dependence of a highly spin-polarized material, La0.67Sr0.33MnO3, with Andreev reflection spectroscopy. The polarization value obtained is the same as that determined using a conventional superconductor Pb but the temperature dependence of the spin polarization can be measured up to 52 K, a temperature range, which is several times wider than that using a typical conventional superconductor. The result excludes spin-parallel triplet pairing in the iron superconductor.

ContributorsGifford, Jessica (Author) / Chen, B. B. (Author) / Zhang, Ji (Author) / Zhao, Gejian (Author) / Kim, Dongrin (Author) / Li, Bochao (Author) / Wu, D. (Author) / Chen, Tingyong (Author) / College of Liberal Arts and Sciences (Contributor)
Created2016-11-21
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The giant magnetoresistance (GMR) of a point contact between a Co/Cu multilayer and a superconductor tip varies for different bias voltage. Direct measurement of spin polarization by Andreev reflection spectroscopy reveals that the GMR change is due to a change in spin polarization. This work demonstrates that the GMR structure

The giant magnetoresistance (GMR) of a point contact between a Co/Cu multilayer and a superconductor tip varies for different bias voltage. Direct measurement of spin polarization by Andreev reflection spectroscopy reveals that the GMR change is due to a change in spin polarization. This work demonstrates that the GMR structure can be utilized as a spin source and that the spin polarization can be continuously controlled by using an external magnetic field.

ContributorsGifford, Jessica (Author) / Zhao, Gejian (Author) / Li, Bochao (Author) / Tracy, Brian (Author) / Zhang, Ji (Author) / Kim, Dongrin (Author) / Chen, Tingyong (Author) / College of Liberal Arts and Sciences (Contributor)
Created2016-05-23