Upper critical field of the 122-type iron pnictide superconductors

Details Upper critical field of the 122-type iron pnictide superconductors Upper critical field of the 122-type iron pnictide superconductors

2011-01-17

arxiv.org/abs/1101.3150v1

Physics

Condensed Matter

Superconductivity

4 pages,4 figures, accepted by J. Phys. Chem. Solids

Scientific paper

10.1016/j.jpcs.2010.10.070

The upper critical fields ($H_{c2}$) of the single crystals $\rm(Sr,Na)Fe_2As_2$ and $\rm Ba_{0.55}K_{0.45}Fe_2As_2$ were determined by means of measuring the electrical resistivity, $ \rho_{xx}(\mu_0H)$, using the facilities of pulsed magnetic field at Los Alamos. In general, these compounds possess a very large upper critical field ($H_{c2}(0)$) with a weak anisotropic effect. The detailed curvature of $H_{c2}(T_c)$ may depend on the magnetic field orientation and the sample compositions. We argue that such a difference mainly results from the multi-band effect, which might be modified via doping.

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