Evidence of an atomistic universal structural entity for high-temperature superconductivity
- Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 (United States)
- Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 (United States)
Evidence is presented that the spatial regions responsible for superconductivity in NdBa{sub 2}Cu{sub 3}O{sub 7}, Nd{sub 2{minus}z}Ce{sub z}CuO{sub 4}, and Nd{sub 2{minus}z}Ce{sub z}Sr{sub 2}Cu{sub 2}NbO{sub 10} are different in the three materials, based on the locations of the superconducting condensates as extracted from: pair-breaking data, the locations of the charge reservoirs, the effects of Ce doping, crystal-field splitting, and the different charges on the Nd{sub 2{minus}z}Ce{sub z}CuO{sub 4} in {open_quotes}free{close_quotes} bulk Nd{sub 2{minus}z}Ce{sub z}CuO{sub 4} and in {open_quotes}superlattice{close_quotes} Nd{sub 2{minus}z}Ce{sub z}CuO{sub 4}/SrO/NbO{sub 2}/SrO/CuO{sub 2}/. Analyses show that the universal entity responsible for superconductivity is not a spatially extended or planar structure, but is atomistic charge-reservoir oxygen. This suggests that Ba{sub 1{minus}a}K{sub a}Pb{sub 1{minus}b}Bi{sub b}Cu{sub 3} should be reclassified as a high-temperature oxide superconductor, with T{sub c}{approx}32K for b{r_arrow}1. Predictions of the critical temperatures of Nd{sub 2{minus}z}Ce{sub z}Sr{sub 2}Cu{sub 2}NbO{sub 10} and Nd{sub 2{minus}z}Ce{sub z}Sr{sub 2}Cu{sub 2}TaO{sub 10}, based on this picture, are successful. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 573873
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 3 Vol. 83; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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