Skip to main content Accessibility help

The thermopower of Nd1+xBa2−xCu3Oy in a comparative study of effects of Ba-site doping versus chain-Cu-site doping

  • B. Fisher (a1), J. Genossar (a1), L. Patlagan (a1), G. M. Reisner (a1) and A. Knizhnik (a1)...


We report the results of measurements of resistivity up to 300 K and of thermoelectric power up to 400 K on ceramic samples of Nd1+xBa2−xCu3Oy with 0 ≤ x ≤ 0.65. The samples were fully oxygenated; they were characterized by x-ray diffraction and iodometric titration. The results are compared with data from literature reporting on effects of substitutions on the Ba site in 1–2–3 compounds and with our earlier experiments on substitution of Co for chain Cu. The focus is on the metal-nonmetal transition and on the nonmetallic regime in all these systems. Tc and the temperature dependence of S close to the metal-nonmetal transition and in the nonmetallic state seem to be determined by a single parameter, irrespective of the nature of the dopant. This result and its implications on the electronic structure of Rba2Cu3Oy (R = Y, or lanthanide ion) will be discussed.



Hide All
1.Yoo, S. I., Sakai, N., Takaichi, H., Higuchi, T., and Murakami, M., Appl. Phys. Lett. 65, 633 (1994).
2.Zhang, K., Dabrowski, B., Segre, C. U., Hinks, D. G., Schuller, I. K., Jorgensen, D. J., and Slaski, M., J. Phys. C 20, L935 (1987).
3.Takita, K., Katoh, H., Akinaga, H., Nishino, M., Ishigaki, T., and Asano, H., Jpn. J. Appl. Phys. 27, L57 (1988).
4.Van Woerden, R. A. M. and deLeeuw, D. M., Physica C 165, 221 (1990).
5.Plackowski, T., Sulkowski, C., Bukowski, Z., Wlosewicz, D., and Rogacki, K., Physica C 254, 331 (1995).
6.Vladimirskaya, E. V., Gasumyants, V. E., Kaidanov, V. E., Patrina, I. B., Razumeenko, M. V., Baranskaya, N. P., Kobelev, V. F., and Prikhod'ko, O. A., Physics of the Solid State 35, 1571 (1993).
7.Yoo, S. I., Murakami, M., Sakai, N., Higuchi, T., and Tanaka, S., Jpn. J. Appl. Phys. 33, L1000 (1994).
8.Lee, D. F., Partsinevelos, C. S., Presswood, R. G. Jr, and Salama, K., J. Appl. Phys. 76, 603 (1994).
9.Obertelli, S. D., Cooper, J. R., and Tallon, J. L., Phys. Rev. B 46, 14928 (1992).
10.Tallon, J. L., Cooper, J. R., de Silva, P. S. I. P. N., Williams, G. V. M., and Loram, J. W., Phys. Rev. Lett. 75, 4114 (1995).
11.Carrington, A. and Cooper, J. R., Physica C 219, 119 (1994).
12.Fisher, B., Genossar, J., Patlagan, L., Reisner, G. M., and Knizhnik, A., J. Appl. Phys. 80, 898 (1996); B. Fisher, J. Genossar, L. Patlagan, and G. M. Reisner, Phys. Rev. B 48, 16056 (1993).
13.Kramer, M. J., Yoo, S. I., McCallum, R. W., Yelon, W. B., Xie, H., and Allenspach, P., Physica C 219, 145 (1994).
14.Murakami, M., Yoo, S. I., Higuchi, T., Sakai, N., Weltz, J., Koshizuka, N., and Tanaka, S., Jpn. J. Appl. Phys. 33, L715 (1994).
15.Wong-Ng, W., Cook, L. P., Paretzkin, B., Hill, M. D., and Stalick, J. K., J. Am. Ceram. Soc. 77, 2354 (1994).
16.Knizhnik, A., Direktovitch, Y., Goldschmidt, D., and Eckstein, Y., Supercond. Sci. Technol. 6, 209 (1993).
17.Singh, K. K., Morris, D. E., and Sinha, A. P. B., Physica C 224, 231 (1994).
18.Takita, K., Akinaga, H., Ohshima, T., Takeda, Y., and Takano, M., Physica C 191, 509 (1992).
19. See Fig. 14 in Ref. 12.
20. See Table II in Ref. 12.
21.Ouseph, P. J. and O'Bryan, M. Ray, Phys. Rev. B 41, 4124 (1990).
22.Fisher, B., Genossar, J., Lelong, I. O., Kessel, A., and Ashkenazi, J., J. Superconductivity 1, 53 (1988); J. Genossar, B. Fisher, I. O. Lelong, J. Ashkenazi, and L. Patlagan, Physica C 157, 320 (1989).
23. It is possible to combine the better fit at small x in Fig. 3 with that at large z in Fig. 4 by plotting the data, over the whole range of concentrations, as functions of a single variable such as z * = x − η(y − 7), with η = 1 −(ba)/(b 0a 0). Here a 0 and b 0 are the lattice parameters for x = 0.

The thermopower of Nd1+xBa2−xCu3Oy in a comparative study of effects of Ba-site doping versus chain-Cu-site doping

  • B. Fisher (a1), J. Genossar (a1), L. Patlagan (a1), G. M. Reisner (a1) and A. Knizhnik (a1)...


Full text views

Total number of HTML views: 0
Total number of PDF views: 0 *
Loading metrics...

Abstract views

Total abstract views: 0 *
Loading metrics...

* Views captured on Cambridge Core between <date>. This data will be updated every 24 hours.

Usage data cannot currently be displayed