Crystal structure and specific heat of YBa2(Cu1-xZnx)3O7-†(x=0.01 ... 0.1, †=0;0.9)

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Abstract

Properties of a series of Zn-doped YBa2Cu3O7-samples prepared under identical conditions have been studied by powder neutron diffraction (20 K, 270 K), powder X-ray and electron diffraction (290 K), by measurements of specific heat Cp (1.4 K–300 K) and Meissner effect (4 K–100 K). Tc decreases linearly at about 10 K /at% Zn. The Meissner signal is still present for high Zn contents. In contrast to this, the transition in Cp vanishes at x≈0.03. Zn is quantitatively dissolved even at x=0.1. The Cu(1)-(chain-) site incorporates about 50% of the total Zn content, while the two equivalent Cu(2)-(plane-) sites contain 25% each. The occupancy of the O(1)-(chain-) site decreases with increasing Zn content according to the approximate formula YBa2(Cu1-xZnx)3O7-x/2. This leads to an almost constant average copper oxidation state, independently confirmed by iodometric titration. Our findings are discussed in terms of a transition to gapless superconductivity upon Zn-doping.

References (5)

  • A. Junod et al.

    Physica C

    (1988)
  • C.-S. Jee

    J. Supercond.

    (1988)
There are more references available in the full text version of this article.

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