Volume 85, Number 1, January 2009
Article Number 17006
Number of page(s) 5
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
Published online 07 January 2009
EPL, 85 (2009) 17006
DOI: 10.1209/0295-5075/85/17006

Coexistence of the spin-density wave and superconductivity in Ba1-xKxFe2As2

H. Chen1, Y. Ren2, Y. Qiu3, 4, Wei Bao5, R. H. Liu1, G. Wu1, T. Wu1, Y. L. Xie1, X. F. Wang1, Q. Huang3 and X. H. Chen1

1   Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China - Hefei, Anhui 230026, China
2   Advanced Photon Source, Argonne National Laboratory - Argonne, IL 60439, USA
3   NIST Center for Neutron Research, National Institute of Standards and Technology - Gaithersburg, MD 20899, USA
4   Department of Materials Science and Engineering, University of Maryland - College Park, MD 20742, USA
5   Los Alamos National Laboratory - Los Alamos, NM 87545, USA

received 24 July 2008; accepted in final form 1 December 2008; published January 2009
published online 7 January 2009

The relation between the spin-density wave (SDW) and superconducting order is a central topic in the current research on the FeAs-based high-TC superconductors. Conflicting results exist in the LaFeAs(O, F)-class of materials, for which whether the SDW and superconductivity are mutually exclusive or they can coexist has not been settled. Here we show that for the (Ba, K)Fe2As2 system, the SDW and superconductivity can coexist in an extended range of compositions. The availability of single crystalline samples and high value of the energy gaps would make the materials a model system to investigate the high-TC ferropnictide superconductivity.

74.25.Dw - Superconductivity phase diagrams.
75.30.Fv - Spin-density waves.
74.25.-q - Properties of type I and type II superconductors.

© EPLA 2009