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Magneto–resistance study of AFe
2
As
2
(A = Sr, Ba) iron–based compounds

0
We have investigated the magneto–resistance (MR) from the two main AFe2As2 compounds (with A = Sr and Ba) and a low energy Ca ion implanted SrFe2As2 crystal up to 8 T. We show that MR from BaFe2As2 and SrFe2As2 single crystals are similar and a quantum linear MR model favoured by some authors is probably not appropriate especially since the MR is not linear. The SrFe2As2 sample with a near surface Ca concentration of 0.8 at.% has a larger MR at low temperatures that is probably due to current transport in the near surface region and in an inhomogeneous normal and superconducting state.

Keywords: iron pnictides, superconductivity, magneto–resistance, Dirac fermions, quantum linear magneto–resistance, nanotechnology

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2
As
2
(A = Sr, Ba) iron–based compounds
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