Sulfur stoichiometry effects in highly spin polarized Co S 2 single crystals

L. Wang; T. Y. Chen; C. L. Chien; C. Leighton

doi:10.1063/1.2210291

Sulfur stoichiometry effects in highly spin polarized Co S ₂ single crystals

L. Wang, T. Y. Chen, C. L. Chien, C. Leighton

Chemical Engineering and Materials Science

Research output: Contribution to journal › Article › peer-review

35 Scopus citations

Abstract

Recent experiments on polycrystalline Co1-x Fex S2 demonstrated composition control over the spin polarization by Fermi level manipulation. We report here the growth and characterization of Co S2 single crystals with fine control over the stoichiometry by chemical vapor transport. At the ideal Co:S atomic ratio we observe a minimum in the low temperature resistivity and the x-ray rocking curve width, coincident with a maximum in the residual resistivity ratio and the low temperature magnetoresistance. Point contact Andráev reflection on stoichiometric crystals indicates a spin polarization at the Fermi energy of 64%, a significant increase over the 56% observed in polycrystals.

Original language	English (US)
Article number	232509
Journal	Applied Physics Letters
Volume	88
Issue number	23
DOIs	https://doi.org/10.1063/1.2210291
State	Published - Jun 5 2006

Bibliographical note

Funding Information:
This work was supported primarily by the MRSEC program of the National Science Foundation.

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abstract = "Recent experiments on polycrystalline Co1-x Fex S2 demonstrated composition control over the spin polarization by Fermi level manipulation. We report here the growth and characterization of Co S2 single crystals with fine control over the stoichiometry by chemical vapor transport. At the ideal Co:S atomic ratio we observe a minimum in the low temperature resistivity and the x-ray rocking curve width, coincident with a maximum in the residual resistivity ratio and the low temperature magnetoresistance. Point contact Andr{\'a}ev reflection on stoichiometric crystals indicates a spin polarization at the Fermi energy of 64%, a significant increase over the 56% observed in polycrystals.",

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AU - Chen, T. Y.

AU - Chien, C. L.

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AB - Recent experiments on polycrystalline Co1-x Fex S2 demonstrated composition control over the spin polarization by Fermi level manipulation. We report here the growth and characterization of Co S2 single crystals with fine control over the stoichiometry by chemical vapor transport. At the ideal Co:S atomic ratio we observe a minimum in the low temperature resistivity and the x-ray rocking curve width, coincident with a maximum in the residual resistivity ratio and the low temperature magnetoresistance. Point contact Andráev reflection on stoichiometric crystals indicates a spin polarization at the Fermi energy of 64%, a significant increase over the 56% observed in polycrystals.

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