Abstract
New cuprates with nominal composition (Pb0.8W0.2)Sr2(Nd1 − x Ca x )Cu2O7 − δ(0≤x≤1) were synthesized by solid-state reaction in N2. The crystal structure was characterized by X-ray powder diffraction (XRD) as tetragonal. Direct current electrical resistance measurements were applied to check the existence of superconductivity in these cuprates. Superconductivity with T c (onset) up to 82 K is observed when x = 0.6. Synthesis in N2 is necessary in obtaining superconductivity in these cuprates. Preparation in air or post-treatment in flowing oxygen destroys superconductivity. A comparison is made with previous Pb-based 1212 superconducting oxides. The valence of Pb and the possible position of W in the lattice are discussed.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
REFERENCES
R. S. Liu, D. Groult, A. Maignan, S. F. Hu, D. A. Jefferson, B. Raveau, C. Michel, M. Hervieu, and P. P. Edwards, Physica C 195, 35 (1992).
T. P. Beales, W. G. Freeman, S. R. Hall, M. R. Harrison, and J. M. Parberry, Physica C 205, 383 (1993).
M. A. Subramanian, J. Gopalakrishnan, C. C. Torardi, P. L. Gai, E. D. Boyes, T. R. Ashew, R. B. Flippen, W. E. Farneth, and A. W. Sleight, Physica C 157, 124 (1989).
T. Rouillon, J. Provost, M. Hervieu, D. Groult, C. Michel, and B. Raveau, Physica C 159, 201 (1989); J. Solid State Chem. 84, 375 (1990).
R. S. Liu, S. F. Hu, and P. P. Edwards, Appl. Phys. Lett. 59, 985 (1991).
A. Maignan, D. Groult, R. S. Liu, T. Rouillon, P. Daniel, C. Michel, M. Hervieu, and B. Raveau, J. Solid State Chem. 102, 31 (1993).
J. R. Min, J. K. Liang, H. Jin, C. Wang, H. Chen, Y. D. Yu, C. Dong, and G. H. Rao, Physica C 249, 196 (1995).
W. Widder, M. Franz, L. Bauernfeind, and H. F. Braun, Physica C 217, 121 (1993).
H. B. Liu and D. E. Morris, Phys. Rev. B 44, 5369 (1991).
T. Maeda, K. Sakuyama, S. Koriyama, H. Yamauchi, and S. Tanaka, Phys. Rev. B 43, 7866 (1991).
S. F. Hu, D. A. Jefferson, R. S. Liu, and P. P. Edwards, J. Solid State Chem. 96, 455 (1992).
H. Zhang, G. S. Chen, S. Q. Feng, K. Wu, X. Zhu, and Q. R. Feng, Solid State Commun. 83, 601 (1992).
Y. Zhao, F. Shi, H. K. Liu, C. Andrikidis, and S. X. Dou, Physica C 212, 451 (1993).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Zhao, Y.D., Qian, Y.T., Tang, K.B. et al. Synthesis and Superconductivity of New Cuprates (Pb0.8W0.2)Sr2(Nd1 − x Ca x )Cu2O7 − δ . Journal of Superconductivity 11, 729–732 (1998). https://doi.org/10.1023/A:1022641123127
Issue Date:
DOI: https://doi.org/10.1023/A:1022641123127