Effects of Excess Fe on Upper Critical Field and Magnetotransport in Fe1+y(Te1−xSx)z

Journal Article · Sat May 01 04:00:00 EDT 2010 · Physical Review. B, Condensed Matter and Materials Physics

OSTI ID:984809

Petrovic, C; Lei, H; Hu, R; Choi, E S; Warren, J B

We have investigated the upper critical field anisotropy and magnetotransport properties of Fe{sub 1.14(1)}Te{sub 0.91(2)}S{sub 0.09(2)} single crystals in stable magnetic fields up to 35 T. The results show that {mu}{sub 0}H{sub c2}(T) along the c axis and in the ab plane exhibit saturation at low temperatures. The anisotropy of {mu}{sub 0}H{sub c2}(T) decreases with decreasing temperature, becoming nearly isotropic for T {yields} 0. Our analysis indicates that the spin-paramagnetic pair breaking with spin-orbital scattering is responsible for the behavior of {mu}{sub 0}H{sub c2}(T). Furthermore, from analysis of the normal-state properties, we show evidence that the excess Fe is a key factor determining the normal- and superconducting-state physical properties.

• Research Organization: BROOKHAVEN NATIONAL LABORATORY (BNL)
• Sponsoring Organization: Doe - Office Of Science
• DOE Contract Number: AC02-98CH10886
• OSTI ID: 984809
• Report Number(s): BNL--93797-2010-JA; KC0202010
• Journal Information: Physical Review. B, Condensed Matter and Materials Physics, Journal Name: Physical Review. B, Condensed Matter and Materials Physics Journal Issue: 18 Vol. 81; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ANISOTROPY
CRITICAL FIELD
MAGNETIC FIELDS
MONOCRYSTALS
PHYSICAL PROPERTIES
SATURATION
SCATTERING
critical field anisotropy
high transition temperature
iron-based superconductors