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- Title
Study of the Semiconducting Behavior in Zr-Doped Bi<sub>1.95</sub>Sr<sub>1.65</sub>La<sub>0.4</sub>CuO<sub>6+δ</sub> Ceramic Cuprates.
- Authors
Boudjaoui, S.; Mahamdioua, N.; Altintas, S. P.
- Abstract
The effect of zirconium substitution on copper sites in ceramic cuprates of the Bi1.95Sr1.65La0.4Cu1−xZrxO6+δ system, where x = 0.0, 0.2, and 0.4, on the structural and superconducting properties has been examined. Undoped and Zr-doped samples were synthesized using the traditional solid-state reaction technique. The x-ray diffraction analysis showed that the phase in the undoped sample is recognized as the Raveau phase, also known as a phase R-2201 superconductor, whereas it totally transforms to phase I, also known as a phase I-2201 semiconductor, in the Zr-doped samples. Electrical resistivity measurements using the four-probe method show a superconductor state in the undoped sample below TC,Onset = 35 K. In the Zr-doped samples, the results demonstrate that superconductivity is suppressed, and a semi-conducting behavior is shown. The loss of superconductivity in the system may be attributed to the excess oxygen intercalation in the Bi-O double layers and to the localization of the charge carriers. The transport process in the Zr-doped samples is followed by a two-dimensional variable range hopping conduction.
- Subjects
ELECTRICAL resistivity; COPPER-zirconium alloys; CERAMICS; SUPERCONDUCTIVITY; HOPPING conduction
- Publication
Journal of Electronic Materials, 2023, Vol 52, Issue 9, p6247
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-023-10570-z