Electronic structures, hole-doping, and superconductivity of the s = 1, 2, 3, and 4 members of the (Cu, Mo)-12s2 homologous series of superconductive copper oxides.
We demonstrate that the T{sub c} value of superconductive copper oxides does not depend on the distance between two adjacent CuO{sub 2} planes as long as the hole-doping level and the immediate (crystal) chemical surroundings of the planes are kept the same. Experimental evidence is accomplished for the homologous series of (Cu,Mo)-12s2, the member phases of which differ from each other by the number (s) of cation layers in the fluorite-structured (Ce,Y)-[O{sub 2}-(Ce,Y)]{sub s-1} block between the CuO{sub 2} planes. X-ray absorption near-edge structure spectroscopy is employed as a probe for the hole states of these phases. The s = 1 member appears to be more strongly doped with holes than other phases of the series and accordingly to possess the highest T{sub c} value of 87 K. For s {ge} 2, unexpectedly, both the CuO{sub 2} plane hole concentration and the value of T{sub c} ({approx}55 K) remain constant, being independent of s.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Tekes; Academy of Finland; Ministry of Education, Culture, Sports, Science and Technology of Japan
- DOE Contract Number:
- DE-AC02-06CH11357
- OSTI ID:
- 992061
- Report Number(s):
- ANL/MSD/JA-67971; JACSAT; TRN: US201021%%496
- Journal Information:
- J. Am. Chem. Soc., Vol. 132, Issue 12/17/2009; ISSN 0002-7863
- Country of Publication:
- United States
- Language:
- ENGLISH
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