An unconventional iron superconductor, SmO[subscript 0.7]F[subscript 0.3]FeAs, has been utilized to determine the spin polarization and temperature dependence of a highly spin-polarized material, La[subscript 0.67]Sr[subscript 0.33]MnO[subscript 3], 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.
Gifford, J. A., Chen, B. B., Zhang, J., Zhao, G. J., Kim, D. R., Li, B. C., . . . Chen, T. Y. (2016). Determination of spin polarization using an unconventional iron superconductor. AIP Advances, 6(11), 115023. doi:10.1063/1.4968620
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