High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12

Details High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12 High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12

2005-10-27

arxiv.org/abs/cond-mat/0510736v1

Phys. Rev. B 72, 180407(R) (2005)

Physics

Condensed Matter

Materials Science

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Scientific paper

10.1103/PhysRevB.72.180407

The spin polarization of ferromagnetic alkali-metal iron antimonides KFe4Sb12 and NaFe4Sb12 is studied by point-contact Andreev reflection using superconducting Nb and Pb tips. From these measurements an intrinsic transport spin polarization Pt of 67% and 60% for the K and Na compound, respectively, is inferred which establishes these materials as a new class of highly spin polarized ferromagnets. The results are in accord with band structure calculations within the local spin density approximation (LSDA) that predict nearly 100% spin polarization in the density of states. We discuss the impact of calculated Fermi velocities and spin fluctuations on Pt.

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