High spin polarization in the ferromagnetic filled skutterudites KFe4Sb12 and NaFe4Sb12

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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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Materials Science, Strongly Correlated Electrons

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http://salesiana.dossiersoluciones.com/handle/123456789/103081

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/cond-mat/0510736
 http://arxiv.org/abs/cond-mat/0510736
 Phys. Rev. B 72, 180407(R) (2005)
 doi:10.1103/PhysRevB.72.180407

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arXiv