Characteristics of oxygen over-reduced Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4{minus}{ital y}} films

Journal Article · Mon Apr 17 04:00:00 EDT 1995 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.113928· OSTI ID:29250

Mao, S N; Jiang, W; Xi, X X; Li, Q; Peng, J L; Greene, R L; Venkatesan, T ^[1]; Beesabathina, D P; Salamanca-Riba, L ^[2]; Wu, X D ^[3]

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1. Center for Superconductivity Research, Department of Physics, University of Maryland, College Park, Maryland 20742 (United States)
2. Center for Superconductivity Research, Materials and Nuclear Engineering Department, University of Maryland, College Park, Maryland 20742 (United States)
3. STC, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

We have studied the oxygen doping effect in thin Nd{sub 1.85}Ce{sub 0.15}CuO{sub 4{minus}{ital y}} (NCCO) films. Contrary to the common believe that the disappearance of superconductivity in the over-reduced NCCO samples is a consequence of phase decomposition, we found that there exists an over-reduced region in which the crystallographic structure of the film remains essentially the same as in the optimum-oxygen doped region, but the film becomes insulating. Rutherford backscattering spectroscopy channeling analysis reveals that the oxygen over-reduction increases atomic distortion in the lattice. This work provides strong support to previous transport studies by Jiang {ital et} {ital al}. [Phys. Rev. Lett. {bold 73}, 1291 (1994)], which suggested the existence of both electron and hole carriers in superconducting NCCO.

• OSTI ID: 29250
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 16 Vol. 66; ISSN 0003-6951; ISSN APPLAB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANNEALING
CERIUM OXIDES
CHEMICAL COMPOSITION
COPPER OXIDES
CRYSTAL DOPING
CRYSTAL STRUCTURE
ELECTRIC CONDUCTIVITY
HIGH-TC SUPERCONDUCTORS
MICROSTRUCTURE
NEODYMIUM OXIDES
OXYGEN ADDITIONS
SUPERCONDUCTIVITY
TRANSITION TEMPERATURE