On the suppression of superconductivity in Y1−xPrxBa2Cu3O7−δ

Neukirch, U. ; Simmons, C. T. ; Sladeczek, P. ; Laubschat, C. ; Strebel, O. ; Kaindl, G. ; Sarma, D. D. (1988) On the suppression of superconductivity in Y1−xPrxBa2Cu3O7−δ EPL: Europhysics Letters, 5 (6). p. 567. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/5/6/015

Related URL: http://dx.doi.org/10.1209/0295-5075/5/6/015


Y1−xPrxBa2Cu3O7−δ compounds exhibit a progressive decrease in superconducting transition temperature with increasing x. Using soft-X-ray absorption spectroscopy at the Pr-MIV,V thresholds, Pr is shown to be trivalent for all x in these compounds contrary to expectations, excluding an obvious mechanism for the suppression of Tc based on the tetravalency of Pr. From a discussion of other possible mechanisms it is suggested that Tc decreases through changes in electronic-band structure upon Pr substitution leading ultimately to a semiconducting behaviour for x=1.0.

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