On the valence state of Hg in (Hg, Cr)Sr{sub 2}CuO{sub 4+{delta}} superconductor

The 1201-type of superconducting samples of nominal composition (Hg{sub 0.7}Cr{sub 0.3})Sr{sub 2}CuO{sub 4+{delta}}, were synthesised in partial vacuum and subsequently annealed in oxygen and argon. The T{sub c} onset for the different samples is found to be {approx}58 K. Hg L{sub III}-edge measurements have clearly shows that Hg is in divalent state in all the (Hg,Cr)-1201 samples. (author)