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Evidence for d-Electron Localization in YBa2(Cu1−xZnx)3O7 for 0<x<0.16

  • C. Jee (a1), D. Nichols (a1), J. Ciasullo (a1), J. E. Crow (a1), T. Mihalisin (a1), G. N. Myer (a1), M. V. Kuric (a1), S. H. Bloom (a1) and R. P. Guertin (a2)...

Abstract

Zn substitution for Cu in YBa2Cu3O7 rapidly reduces the superconducting transition temperature, Tc. Superconductivity is quenched between x=0.08 (T =30 K) and x=0.10. The normal state paramagnetism grows with Zn substu-tition, presumably due to increased localization on the Cu sublattice. Susceptibility studies of oxygen depleted (nonsuperconducting) Zn-substituted samples support this. Strong non-linear isothermal magnetization suggesting an internal magnetic field is found at T=4.2 K in samples with Zn concentration near to the critical value for suppression of superconductivity. The results are discussed in terms of increased localization of d-electrons on the Cu sites with increasing Zn concentration, which is consistent with recent EPR data.

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1. Hor, T.H., Meng, R.L., Wang, Y.Q., Gao, L., Huang, Z.J., Dechtold, J., Foster, K. and Chu, C.W., Phys. Rev. Lett. 58 (1987).
2. See Superconductivity in Ternary Compounds I, edited by Fischer, O. and Maple, M.B., Topics in Current Physics, Vol. 32 (Springer-Verlag, New York, 1982).
3. Crow, J.E. et al, in preparation.
4. Bloom, S.H., Kuric, M.V., Guertin, R.P., Jee, C., Nichols, D., Kaczanowicz, E., Crow, J.E., Myer, G. and Salomon, R.E., J. Magn. Magn. Mat. 68, L135 (1987).

Evidence for d-Electron Localization in YBa2(Cu1−xZnx)3O7 for 0<x<0.16

  • C. Jee (a1), D. Nichols (a1), J. Ciasullo (a1), J. E. Crow (a1), T. Mihalisin (a1), G. N. Myer (a1), M. V. Kuric (a1), S. H. Bloom (a1) and R. P. Guertin (a2)...

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