Physical properties in hole-doped SrFe$_{2-x}$Cu$_x$As$_2$ single crystals

Y. J. Yan; P. Cheng; J. J. Ying; X. G. Luo; F. Chen; H. Y. Zou; A. F. Wang; G. J. Ye; Z. J. Xiang; J. Q. Ma; X. H. Chen

paper

Physical properties in hole-doped SrFe $_{2 - x}$ Cu $_{x}$ As $_{2}$ single crystals

arXiv:1212.0295

Abstract

We report the structural, magnetic and electronic transport properties of SrFe $_{2 - x}$ Cu $_{x}$ As $_{2}$ single crystals grown by self-flux technique. SrCu $_{2}$ As $_{2}$ and SrFe $_{2}$ As $_{2}$ both crystallize in ThCr $_{2}$ Si $_{2}$ -type (122-type) structure at room temperature, but exhibit distinct magnetic and electronic transport properties. The x-ray photoelectron spectroscopy(XPS) Cu-2p core line position, resistivity, susceptibility and positive Hall coefficient indicate that SrCu $_{2}$ As $_{2}$ is an sp-band metal with Cu in the 3d $^{10}$ electronic configuration corresponding to the valence state Cu $^{1 +}$ . The almost unchanged Cu-2p core line position in SrFe $_{2 - x}$ Cu $_{x}$ As $_{2}$ compared with SrCu $_{2}$ As $_{2}$ indicates that partial Cu substitutions for Fe in SrFe $_{2}$ As $_{2}$ may result in hole doping rather than the expected electron doping. No superconductivity is induced by Cu substitution on Fe sites, even though the structural/spin density wave(SDW) transition is gradually suppressed with increasing Cu doping.

5 pages, 6 figures

Physical properties in hole-doped SrFe2−x​Cux​As2​ single crystals

Abstract

Physical properties in hole-doped SrFe $_{2 - x}$ Cu $_{x}$ As $_{2}$ single crystals