Upper critical field in Ba(Fe1-xCox)2As2 and FeSe1-x Tex compounds
Abstract
We report Hc2 measurements in high magnetic field up to 31 T on Ba(Fe1-xCo1-x)2As2 and FeSe1-x Tex pnictide compounds for different doping levels. Both materials exhibit a very high upper critical fields and unconventional temperature dependencies of Hc2(T) with the extremely high slopes dHc2/dT from 10 to 30 T/K near Tc and a relatively low anisotropy: γ=Hc2 ^// / Hc2 ^// Hc2 ^ . - Hc2 ^ for the doped ternary compound and γ 1.11.2 for the binary one. The observed temperature dependences of Hc2(T) and the high Hc2 values well above the BCS paramagnetic limit indicate the importance of the Zeeman pairbreaking effects in these compounds.
- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2009
- Bibcode:
- 2009APS..MARY35005T