Title: Magneto-resistance study of AFe2As2 (A = Sr, Ba) iron-based compounds

Authors: S.V. Chong; G.V.M. Williams; S. Sambale; J. Kennedy; K. Kadowaki

Addresses: Callaghan Innovation Research Limited, P.O. Box 31310, Lower Hutt, New Zealand ' MacDiarmid Institute, School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand ' Callaghan Innovation Research Limited, P.O. Box 31310, Lower Hutt, New Zealand; MacDiarmid Institute, School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand ' National Isotope Centre, GNS Science, P.O. Box 31312, Lower Hutt, New Zealand ' Institute of Materials Science, University of Tsukuba, 1-1-1, Tennodai, Tsukuba, Ibaraki, Japan

Abstract: 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.

DOI: 10.1504/IJNT.2014.060558

International Journal of Nanotechnology, 2014 Vol.11 No.5/6/7/8, pp.403 - 411

Published online: 14 Apr 2014 *

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