Determination of spin polarization using an unconventional iron superconductor

J. A. Gifford; B. B. Chen; J. Zhang; G. J. Zhao; D. R. Kim; B. C. Li; D. Wu; T. Y. Chen

doi:10.1063/1.4968620

AIP Advances (Nov 2016)

Determination of spin polarization using an unconventional iron superconductor

J. A. Gifford,
B. B. Chen,
J. Zhang,
G. J. Zhao,
D. R. Kim,
B. C. Li,
D. Wu,
T. Y. Chen

Affiliations

J. A. Gifford: Department of Physics, Arizona State University, Tempe, AZ 85287, USA
B. B. Chen: Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, China
J. Zhang: Department of Physics, Arizona State University, Tempe, AZ 85287, USA
G. J. Zhao: Department of Physics, Arizona State University, Tempe, AZ 85287, USA
D. R. Kim: Department of Physics, Arizona State University, Tempe, AZ 85287, USA
B. C. Li: Department of Physics, Arizona State University, Tempe, AZ 85287, USA
D. Wu: Department of Physics, National Laboratory of Solid State Microstructures, Nanjing University, China
T. Y. Chen: Department of Physics, Arizona State University, Tempe, AZ 85287, USA

DOI: https://doi.org/10.1063/1.4968620
Journal volume & issue: Vol. 6, no. 11
pp. 115023 – 115023-7

Abstract

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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 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.

Published in AIP Advances

ISSN: 2158-3226 (Online)
Publisher: AIP Publishing LLC
Country of publisher: United States
LCC subjects: Science: Physics
Website: http://aipadvances.aip.org/

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