期刊
PHYSICAL REVIEW B
卷 80, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214514
关键词
electrical resistivity; iron compounds; magnetic anisotropy; magnetic moments; magnetic superconductors; magnetic susceptibility; percolation; spin density waves; stoichiometry; tellurium compounds; vacancies (crystal)
资金
- U. S. Department of Energy by Brookhaven Science Associates [DE-Ac0298CH10886]
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DEAC02-06CH11357]
- Office of Basic Energy Sciences of the U. S. Department of Energy
We report synthesis of high-quality Fe1+y(Te1-xSx)(z) single crystals and a comprehensive study of structural, magnetic, and transport properties. We demonstrate the very small upper critical field anisotropy of Fe1+y(Te1-xSx)(z), gamma(H)=H-c2(c)/H-c2(perpendicular to c). The value of gamma(H) reaches 1.05 at T=0.65T(C) for Fe1.12Te0.83S0.11 while still maintaining large values of upper critical field. There is high sensitivity to material stoichiometry which includes vacancies on the Te(S) site. Our results reveal competition and coexistence of magnetic order and percolative superconductivity for x >= 0.03 while zero resistivity is achieved for x >= 0.1.
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