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The single-site Korringa-Kohn-Rostoker Coherent Potential Approximation(KKR-CPA) ignores short range ordering present in disordered metallic systems.In this paper, we establish a new technique to fix this shortcoming byembedding an averaged cluster that displays chemical short range order (SRO).The degree of SRO can be tuned by externally defined order parameters. Thisaveraged cluster can be embedded in the single site CPA medium, or aself-consistently obtained effective medium that contains SRO information. Thevalidity of this method is demonstrated by applying it to two alloy systems -the CuZn body centered cubic (BCC) solid solution, and AlCrTiV, a four-elementBCC high entropy alloy. A comparison between the non-self-consistent andself-consistent modes is also provided for the two above mentioned systems. Wemake the code available on the internet. Planned extensions to this work arediscussed.

An averaged cluster approach to including chemical short range order in KKR-CPA