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We report the structural, magnetic and electronic transport properties ofSrFe$_{2-x}$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 andelectronic transport properties. The x-ray photoelectron spectroscopy(XPS)Cu-2p core line position, resistivity, susceptibility and positive Hallcoefficient indicate that SrCu$_2$As$_2$ is an sp-band metal with Cu in the3d$^{10}$ electronic configuration corresponding to the valence stateCu$^{1+}$. The almost unchanged Cu-2p core line position inSrFe$_{2-x}$Cu$_x$As$_2$ compared with SrCu$_2$As$_2$ indicates that partial Cusubstitutions for Fe in SrFe$_2$As$_2$ may result in hole doping rather thanthe expected electron doping. No superconductivity is induced by Cusubstitution on Fe sites, even though the structural/spin density wave(SDW)transition is gradually suppressed with increasing Cu doping.

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