Positron annihilation study of oxygen vacancies in Y1Ba2Cu3O7-x

Bharathi, A. ; Hariharan, Y. ; Sood, A. K. ; Sankara Sastry, V. ; Janawadkar, M. P. ; Sundar, C. S. (1988) Positron annihilation study of oxygen vacancies in Y1Ba2Cu3O7-x EPL: Europhysics Letters, 6 (4). pp. 369-374. ISSN 0295-5075

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Official URL: http://iopscience.iop.org/0295-5075/6/4/016/

Related URL: http://dx.doi.org/10.1209/0295-5075/6/4/016


Positron lifetime and Doppler broadened lineshape parameter have been measured as a function of quench temperature in Y1Ba2Cu3O7-x. The mean lifetime, τ̅, and the peak parameter of the Doppler broadened lineshape, I, are observed to decrease as the quench temperature (TQ) is lowered from 925 ° C to 325 ° C. The variations in τ̅ and I with TQ are observed to correlate with the oxygen deficiency (x) measured at a various quench temperatures. The positron lifetime component, τ2, attributed to trapping at oxygen vacancies, is observed to decrease from (200 ± 1) ps in the tetragonal phase (x=0.5) to (190 ± 1) ps in the orthorhombic phase (x = 0.0). The variation in positron annihilation parameters with TQ is qualitatively explained in terms of a change in the charge state of oxygen vacancies.

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