Abstract
Magnetization measurements were carried out on bulk Tl2Ba2CaCu2O8 (referred to as Tl-2212) and on various site-selective substituted Tl-2212 samples. At 5K between 0 and 4.5 T, the 5 at. % Mg-doped Tl-2212 (Tl,Mg-2212) samples displayed enhanced pinning as demonstrated by a field dependent increase of the magnetic critical-current density Jc by 18 to 25 percent over that of pristine Tl-2212. Excess Mg (10–15 at. %), however, is deleterious. Rietveld refinement of the x-ray diffraction pattern showed Mg on the Tl sites. Auger electron spectroscopy analysis showed part of the Mg on grain boundaries. The flux-creep activation energies are higher for flux expulsion than for flux penetration in both Tl-2212 and Tl,Mg-2212 samples; the latter displays higher individual values. Our results demonstrate an increase in the number density of flux lines as a result of increased density of atomic-size-structural, defects by Mg (5 at. %) doping. In the Tl2−yBa2(Ca1−zYz)Cu2O8−x(z=0–0.3; single phase; x and y represent oxygen and thallium vacancies) system also studied, the Tc decreases as z increases. At z=0.3, the sample becomes an antiferromagnetic semiconductor.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
R.M. Hazen, L.W. Finger, R.J. Angel, C.T. Prewitt, N.I. Ross, C.G. Hadidiacos, P.J. Heaney, D.R. Velben, Z. Sheng A. El Ali and A.M. Hermann,Phys. Rev. Lett. 60, 1657 (1988).
D.E. Cox, C.C. Torardi, M.A. Subramanian, J. Gopalakrishnan and A.W. Sleight,Phys. Rev. B 38, 6624 (1988).
M.A. Subramanian, C.C. Torardi, J. Gopalakrishnan, P.L. Gai, J.C. Calabrese, T.R. Askew, R.B. Flippen and A.W. Sleight,Science 242, 249 (1988).
R.D. Blaugher,Processing and Properties of High-Temperature Superconductors, ed. S. Jin (World Scientific, Singapore, 1993) Vol. 1,Bulk Materials, pp. 271–298; and references therein.
D.S. Ginley, J.F. Kwak, R.P. Hellmer, R.J. Baughman, E.L. Venturini and B. Morosin,Appl. Phys. Lett. 53, 406 (1988).
J.E. Tkaczyk, J.A. DeLuca, P.L. Karas, P.J. Bednarczyk, M.F. Garbauskas, R.H. Arendt, K.W. Lay and J.S. Moodera,Appl. Phys. Lett. 61, 610 (1992).
R.S. Liu, D.N. Zheng, J.W. Loram, K.A. Mirza, A.M. Campbell and P.P. Edwards,Appl. Phys. Lett. 60, 1 (1992).
D.H. Kim, K.E. Gray, R.T. Kampwirth, J.C. Smith, D.S. Richeson, T.J. Marks, J.H. Kang, J. Talvacchio and M. Eddy,Physica C 177, 431 (1991).
E.A. Hayri and M. Greenblatt,Physica C 156, 775 (1988).
S.P. Matsuda, T. Doi, A. Soeta, T. Yuasa, N. Inoue, K. Aihara and T. Kamo,Physica C 185–189, 2281 (1991).
T. Kamo, T. Doi, A. Soeta, T. Yuasa, N. Inoue, K. Aihara and S.P. Matsuda,Appl. Phys. Lett. 59, 3186 (1991).
T. Kaneko, H. Yamauchi and S. Tanaka,Physica C 178, 377 (1991).
R.S. Liu, J.L. Tallon and P.P. Edwards,Physica C 182, 119 (1991).
M. Paranthaman, M. Foldeaki and A.M. Hermann,Physica C 192, 161 (1992).
Zhifeng Ren, Min Qi, and Jui H. Wang,Physica C 184, 24 (1991).
C.P. Bean,Rev. Mod. Phys. 36, 31 (1964).
C.W. Hagen and R. Griessen,Studies of High Temperature Superconductors—Advances in Research and Applications, ed. A. Narlikar, (Nova Science Publishers, Singapore, 1989) Vol. 3, pp. 159–195.
C.W. Hagen, R.P. Griessen and E. Salomons,Physica C 157, 199 (1989).
M. Foldeaki, H. Ledbetter, M. Paranthaman, H.M. Duan and A.M. Hermann,J. Supercond. 6, 185 (1993).
M. Paranthaman, H. Ledbetter, M. Foldeaki, D. Balzar, A.J. Nelson and A.M. Hermann,Phys. Rev. B, submitted.
M. Paranthaman, A. Manthiram and J.B. Goodenough,J. Solid State Chem. 98, 343 (1992).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Paranthaman, M., Foldeaki, M. & Hermann, A.M. Effect of site-selective substitution in bulk superconducting Tl2Ba2CaCu2O8 . J. Electron. Mater. 22, 1205–1209 (1993). https://doi.org/10.1007/BF02818062
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF02818062