Theory of Sm{sub 1.5}Ce{sub 0.5}Sr{sub 2}Cu{sub 2}NbO{sub 10}: Critical-temperature and doping effects

Journal Article · Fri Nov 01 04:00:00 EST 1996 · Journal of Low Temperature Physics

DOI:https://doi.org/10.1007/BF00768467· OSTI ID:457230

Blackstead, H A; Pulling, D B ^[1]; Dow, J D ^[2]

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1. Univ. of Notre Dame, IN (United States)
2. Arizona State Univ., Tempe, AZ (United States)

For Sm{sub 1.5}Ce{sub 0.5}Sr{sub 2}Cu{sub 2}NbO{sub 10}, the charge-reservoir oxygen model of superconductivity predicts: (i) T{sub c}{approx}30 K (vs. the observed {approx}28K); (ii) Roughly 1 percent Ni on Cu sites should drive T{sub c} to zero; (iii) The superconductivity originates in the SrO layers; and (iv) The conduction, as with all high-temperature oxide superconductors, is necessarily p-type. The model also explains why this material can superconduct in the presence of the magnetic rare-earth ion Sm and why Gd on Sm sites does not destroy superconductivity, despite structural similarities to Sm{sub 2-z}Ce{sub z}CuO{sub 4} and Gd{sub 2-z}Ce{sub z}CuO{sub 4}, although the former superconducts and-the latter does not.

• Sponsoring Organization: USDOE
• DOE Contract Number: FG02-90ER45427
• OSTI ID: 457230
• Report Number(s): CONF-960808--; CNN: Contract N00014-94-10147; Grant AFOSR-91-0418
• Journal Information: Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 105; ISSN JLTPAC; ISSN 0022-2291
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
CERIUM OXIDES
COPPER OXIDES
DOPED MATERIALS
NICKEL ADDITIONS
NIOBIUM OXIDES
SAMARIUM OXIDES
STRONTIUM OXIDES
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE