Superconductivity, magnetism, and stoichiometry of single crystals of Fe[subscript 1+y](Te[subscript 1−x]S[subscript x])[subscript z]

Journal Article · Tue May 25 00:00:00 EDT 2010 · Phys. Rev. B

DOI:https://doi.org/10.1103/PhysRevB.80.214514· OSTI ID:1006113

Hu, Rongwei; Bozin, Emil S; Warren, J B; Petrovic, C

We report synthesis of high-quality Fe{sub 1+y}(Te{sub 1-x}S{sub x}){sub z} single crystals and a comprehensive study of structural, magnetic, and transport properties. We demonstrate the very small upper critical field anisotropy of Fe{sub 1+y}(Te{sub 1-x}S{sub x}){sub z}, {gamma}{sub H} = H{sub c2}{sup {parallel}c}/H{sub c2}{sup {perpendicular}c}. The value of {gamma}{sub H} reaches 1.05 at T = 0.65 T{sub c} for Fe{sub 1.12}Te{sub 0.83}S{sub 0.11} 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 {ge} 0.03 while zero resistivity is achieved for x {ge} 0.1.

• Research Organization: Argonne National Lab. (ANL), Argonne, IL (United States)
• Sponsoring Organization: USDOE
• OSTI ID: 1006113
• Journal Information: Phys. Rev. B, Vol. 80, Issue (21) ; 12, 2009; ISSN 1098-0121
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CRITICAL FIELD
MAGNETISM
MONOCRYSTALS
SENSITIVITY
STOICHIOMETRY
SUPERCONDUCTIVITY
SYNTHESIS
TRANSPORT
VACANCIES