Abstract
We report on a comparative crystal chemical study of the Tl2−xBa2Ca n Cu n+1O2n+6(n=0, 1, 2) high-T c superconductors. Superconducting properties were determined by DC-conductivity and-susceptibility measurements. An X-ray diffraction analysis reveals the nonstoichiometry of the compounds as a link between structural and superconducting behavior. A comparison of the different structures gives evidence that T1 deficiency in the TlO double layers increases with increasingn; this deficiency causes apparent Cu valences larger than 2+in the superconducting phases thus maintaining the charge balance. By extracting appropriate chemical formulas and performing a bond strength calculation we obtained the mixed-valent oxidation state of copper for the superconducting tetragonal phases as being 2.17+(n=0), 2.25+(n=1) and 2.31+(n=2) respectively; for the non-superconducting orthorhombic phase Tl2−xBa2CuO6−y a Cu valence of about 2+is suggested.
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Sheng, Z.Z., Hermann, A.M.: Nature332, 55 (1988)
Sheng, Z.Z., Hermann, A.M.: Nature332, 138 (1988)
Parkin, S.S.P., Lee, V.Y., Engler, E.M., Nazzal, A.I., Huang, T.C., Gorman, G., Savoy, R., Beyers, R.: Phys. Rev. Lett.60, 2539 (1988)
Subramanian, M.A., Calabrese, J.C., Torardi, C.C., Gopalakrishnan, J., Askew, T.R., Flippen, R.B., Morrissey, K.J., Chowdhry, U., Sleight, A.W.: Nature332, 420 (1988)
Torardi, C.C., Subramanian, M.A., Calabrese, J.C., Gopalakrishnan, J., Morrissey, K.J., Askew, T.R., Flippen, R.B., Chowdhry, U., Sleight, A.W.: Science240, 631 (1988)
Torardi, C.C., Subramanian, M.A., Gopalakrishnan, J., McCarron, E.M., Morrissey, K.J., Askew, T.R., Flippen, R.B., Chowdhry, U., Sleight, A.W.: Phys. Rev. B38, 225 (1988)
Hewat, A.W., Bordet, P., Capponi, J.J., Chaillout, C., Chenavas, J., Godingho, M., Hewat, E.A., Hodeau, J.L., Marezio, M.: Physica C (submitted for publication)
Procedure according to Xie Sishen: Private communication
Müller, K.A., Takashige, M., Bednorz, J.G.: Phys. Rev. Lett.58, 1143 (1987)
Renker, B., Apfelstedt, I., Küpfer, H., Politis, C., Rietschel, H., Schauer, W., Wühl, H., Gottwick, U., Kneissel, H., Rauchschwalbe, U., Spille, H., Steglich, F.: Z. Phys. B-Condensed Matter67, 1 (1987)
Brown, I.D.: Structure and bonding in crystals. Vol. II. New York: Academic Press 1981
Sigrist, T., Zahurak, S.M., Murphy, D., Roth, R.S.: Nature334, 231 (1988)
Parkin, S.S.P., Lee, V.Y., Nazzal, A.I., Savoy, R., Beyers, R., La Placa, S.J.: Phys. Rev. Lett.61, 750 (1988)
Ihara, H., Sugise, R., Hirabayashi, M., Terada, N., Jo, M., Hayashi, K., Negishi, A., Tokumoto, M., Kimura, Y., Shimomura, T.: Nature334, 510 (1988)
Cava, R.J., Batlogg, B., Krajewski, J.J., Farrow, R., Rupp, L.W., White, A.E., Short, K., Peck, W.F., Kometani, T.: Nature332, 814 (1988)
Hinks, D.G., Dabrowski, B., Jorgensen, J.D., Mitchell, A.W., Richards, D.R., Pei, S., Shi, D.: Nature333, 836 (1988)
Torrance, J.B., Tokura, Y., Nazzal, A.I., Bezinge, A., Huang, T.C., Parkin, S.S.P.: Phys. Rev. Lett.61, 1127 (1988)
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Zetterer, T., Otto, H.H., Lugert, G. et al. Crystal chemistry of the Tl2−xBa2Ca n Cu n+1O2n+6 (n=0, 1, 2) high-T c superconductors. Z. Physik B - Condensed Matter 73, 321–328 (1988). https://doi.org/10.1007/BF01314270
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DOI: https://doi.org/10.1007/BF01314270