Measurements of spin polarization of Ru2-xFexCrSi Heusler alloys by Andreev reflection

作者：Shigeta Iduru^*; Murayama Osamu; Hisamatsu Toru; Ito Masakazu; Hiroi Masahiko

来源：Physica C-Superconductivity and Its Applications, 2010, 470: S806-S807.

DOI：10.1016/j.physc.2010.01.044

• Heusler alloy
• Andreev reflection
• Spin polarization
• Half-metal

We report spin polarization P of Ru2-xFexCrSi Heusler alloys by Andreev reflection technique. Ru2-xFexCrSi with the L2(1)-type structure is theoretically predicted to be half-metals in the wide range of the composition x. The experimental results of saturation moment in Fe-rich compounds measurements also support the theoretical prediction. We have measured the differential conductance of Ru2-xFexCrSi/Pb planar-type junctions. The P value of Ru2-xFexCrSi was determined by fitting the differential conductance with the modified Blonder-Tinkham-Klapwijk theory. The behavior of P was independent of the composition x in the Fe-rich region; P = 0.53 for x = 1.5 and P = 0.52 for x = 1.7, respectively. We have found that the spin polarization of Ru2-xFexCrSi in Fe-rich compounds was the similar values to Co-based Heusler alloys.

• 出版日期2010-12