Structural and superconducting properties of La{sub 2{minus}x}R{sub x}Ba{sub 2}Ca{sub y}Cu{sub 4+y}O{sub 10+{delta}} (R=Nd,Gd;y=2x) system
Journal Article
·
· Journal of Applied Physics
A nonsuperconducting La{sub 2}Ba{sub 2}Cu{sub 4}O{sub 9+{delta}} system has been made superconducting by the addition of CaCuO{sub 2}, along with rare earth doping at the La site, with the stoichiometric composition La{sub 2{minus}x}R{sub x}Ca{sub y}Ba{sub 2}Cu{sub 4+y}O{sub 10+{delta}} (R=Nd, Gd, and y=2x). All the samples with 0.0{lt}x{lt}0.5; y=2x were characterized by x-ray diffraction and neutron diffraction measurements for structural properties and by ac susceptibility, dc resistivity, and iodometric analysis for superconducting properties. The x=0.0 sample displays semiconducting behavior. Increasing x increases T{sub c} from less than 15 K for Nd/Gd samples with x=0.1 to {similar_to}78 K for x=0.5 samples. It is interesting to note that the hole concentration and T{sub c} exhibit a strong correlation with increasing dopant concentration. Neutron diffraction studies confirm the occupancy of Ca and Nd ions at the La site with a concomitant displacement of La on to the Ba site. {copyright} 2001 American Institute of Physics.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40204152
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 11 Vol. 89; ISSN 0021-8979
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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