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

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

Research output: Contribution to journalArticle

27 Citations (Scopus)

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 languageEnglish (US)
Article number232509
JournalApplied Physics Letters
Volume88
Issue number23
DOIs
StatePublished - Jun 5 2006

Fingerprint

stoichiometry
sulfur
electrical resistivity
single crystals
polarization
polycrystals
manipulators
vapors
curves
crystals
x rays
energy

Cite this

Sulfur stoichiometry effects in highly spin polarized Co S 2 single crystals. / Wang, L.; Chen, T. Y.; Chien, C. L.; Leighton, C.

In: Applied Physics Letters, Vol. 88, No. 23, 232509, 05.06.2006.

Research output: Contribution to journalArticle

@article{4b516c48c7254890a2828222b4ae4ee5,
title = "Sulfur stoichiometry effects in highly spin polarized Co S 2 single crystals",
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.",
author = "L. Wang and Chen, {T. Y.} and Chien, {C. L.} and C. Leighton",
year = "2006",
month = "6",
day = "5",
doi = "10.1063/1.2210291",
language = "English (US)",
volume = "88",
journal = "Applied Physics Letters",
issn = "0003-6951",
publisher = "American Institute of Physics Publising LLC",
number = "23",

}

TY - JOUR

T1 - Sulfur stoichiometry effects in highly spin polarized Co S 2 single crystals

AU - Wang, L.

AU - Chen, T. Y.

AU - Chien, C. L.

AU - Leighton, C.

PY - 2006/6/5

Y1 - 2006/6/5

N2 - 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.

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.

UR - http://www.scopus.com/inward/record.url?scp=33745030758&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=33745030758&partnerID=8YFLogxK

U2 - 10.1063/1.2210291

DO - 10.1063/1.2210291

M3 - Article

AN - SCOPUS:33745030758

VL - 88

JO - Applied Physics Letters

JF - Applied Physics Letters

SN - 0003-6951

IS - 23

M1 - 232509

ER -