Volume 104, Number 1, October 2013
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||23 October 2013|
Large low-temperature magnetoresistance in SrFe2As2 single crystals
1 Callaghan Innovation Research Limited - P.O. Box 31310, Lower Hutt 5040, New Zealand
2 MacDiarmid Institute, School of Chemical and Physical Sciences, Victoria University of Wellington P.O. Box 600, Wellington 6140, New Zealand
3 National Isotope Centre, GNS Science - P.O. Box 31312, Lower Hutt 5040, New Zealand
4 Institute of Materials Science and Graduate School of Pure & Applied Sciences, University of Tsukuba 1-1-1, Tennodai, Tsukuba, Ibaraki 305-8573, Japan
Received: 18 July 2013
Accepted: 26 September 2013
We present the first report on a large low-temperature magnetoresistance (MR) of more than 1600% in a SrFe2As2 single crystal and 1300% in a low-energy Ca ion-implanted SrFe2As2 single crystal that occurs before the emergence of crystallographic strain-induced bulk superconductivity arising from a sample aging effect. In accordance to band structure calculations from the literature, which consitently show that more than 2 bands are involved in the transport, we have modeled this large MR at high fields using a 3-carrier scenario rather than solely on quantum linear MR model generally used to explain the MR in iron-pnictides. At and below 20 K the large MR may be due to 3-carrier transport in an inhomogeneous state where there are superconducting and metallic regions.
PACS: 74.70.Xa – Pnictides and chalcogenides / 73.43.Qt – Magnetoresistance / 74.81.-g – Inhomogeneous superconductors and superconducting systems, including electronic inhomogeneities
© EPLA, 2013
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