Eur. Phys. J. B (2015) 88: 128
https://doi.org/10.1140/epjb/e2015-50781-6

Regular Article

Charge transport through half-metal/iron pnictide superconductors junctions with spin-active interfaces

¹ National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, P.R. China
² School of Physics and Telecommunication Engineering, Shanxi University of Technology, Hanzhong 723001, P.R. China

^a e-mail: xianqiangzhe@126.com

Received: 7 November 2014
Received in final form: 6 February 2015
Published online: 25 May 2015

Abstract

Based on the extended Blonder-Tinkham-Klapwijk formalism, we study the tunneling spectroscopy in a point contact half-metal/iron pnictide superconductors junctions, allowing for the spin-flip scattering at the interfaces. It is shown that the sharp conductance peak has been observed at an energy within superconducting energy gap in the s_± pairing case. In contrast, for the s₊₊ pairing model, we find the vanishing in-gap conductance peak. Moreover, for the case of s₊₊ and s_± pairing model, the sugap conductance is insensitive to the different superconducting gap ratio. Our results will provide a useful new experimental methods to identify the gap symmetry of the iron pnictide SC.