アンドレーエフ反射法によるハーフメタル型ホイスラー合金Co_{2}MnSiのスピン分極率測定

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概要

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• We have measured the spin polarization of half-metallic Heusler alloy Co_{2}MnSi by the Andreev reflection technique. The differential conductance G(V) of Co_{2}MnSi/Pb junctions was measured in the temperature range between 1.5 K and 10 K. The structure of G(V) became gradually smaller with the increase of temperature and disappeared above the superconducting critical temperature T_{c} of Pb thin films. Temperature dependence of the superconducting energy gap Δ(meV) coincides with that of the Bardeen-Cooper-Schrieffer (BCS) theory. The obtained G(V) was able to be fitted very well by the modified Blonder-Tinkham-Klapwijk (BTK) model up to the T_{C}. We have found the spin polarization of 52.5% for Co_{2}MnSi.

• 鹿児島大学の論文
• 2013-12-30

著者

• 西迫 裕也

  鹿大院理工

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